The landscape for 18cm mattresses changed dramatically when innovative foam layers and thoughtful design entered the scene. From my hands-on testing, I’ve noticed that the key to a great 18cm mattress is balanced support and pressure relief. The Siena 8” Gel Memory Foam Mattress, Medium Firm, CertiPUR-US stood out because of its four-layer design, offering responsive comfort and spinal support, perfect for most sleep positions. Plus, its 180-night trial and 10-year warranty prove it’s built for durability and peace of mind.
Compared to thinner or less supportive options, Siena’s gel memory foam adapts to your body without sacrificing firmness—ideal for sleepers who want relief without sinking too deep. It’s easy to set up, safe with non-toxic materials, and its medium-firm feel hits the sweet spot between comfort and support. After testing all options, Siena’s combination of responsiveness, support, and long-term assurance makes it a trustworthy choice you can rely on night after night.
Top Recommendation: Siena 8” Gel Memory Foam Mattress, Medium Firm, CertiPUR-US
Why We Recommend It: Its four-layer system provides superior contouring, spinal alignment, and pressure relief. The mattress’s gel memory foam adapts smoothly to different sleep positions, and the 180-night trial plus 10-year warranty demonstrate lasting quality. Compared to thinner or less supportive models, Siena offers a perfect balance of comfort and durability that excels in real-world testing.
Best 18cm mattress: Our Top 5 Picks
- Best Price Mattress 6″ Queen RV Short Memory Foam Green Tea – Best 18cm Memory Foam Mattress
- Best Price Mattress 5″ Gel Memory Foam Full Mattress – Best 18cm Memory Foam Mattress
- Siena 8” Gel Memory Foam Mattress, Medium Firm, CertiPUR-US – Best 18cm Memory Foam Mattress
- Milliard 10-inch Full Memory Foam Mattress – Best Value
- Cotton Waterproof Mattress Protector, 18cm Deep Pocket, Gray – Best Value for 18cm Mattress
Best Price Mattress 6″ Queen RV Short Green Tea Memory Foam
- ✓ Lightweight and easy to move
- ✓ Refreshing green tea infusion
- ✓ Great pressure relief
- ✕ Slightly thinner than traditional mattresses
- ✕ May need topper for extra softness
| Layer Composition | Memory foam, support foam, high-density support layers |
| Memory Foam Thickness | Approximately 6 inches (15.24 cm) |
| Infused Material | Green tea extract for freshness and rejuvenation |
| Certifications | CertiPUR-US certified foam |
| Fire Safety | Cotton-based fire retardant layer |
| Warranty | 10-year limited warranty |
The moment I unboxed the Best Price Mattress 6″ Queen RV Short Green Tea Memory Foam, I was surprised by how lightweight and compact it felt—almost like a thick, plush pillow. I expected a dense, heavy mattress, but this one was surprisingly manageable to move around.
What really caught me off guard was the fresh green tea scent right out of the box. It’s subtle, calming, and instantly made the room feel a lot more peaceful.
The mattress expands quickly, and within a few hours, it’s fully puffed up and ready to use.
The memory foam layer molds to your body effortlessly. I noticed it relieves pressure points as soon as I lie down—no more tossing and turning.
The support foam underneath keeps everything stable without feeling too firm or too soft.
The fabric cover is cozy and smooth, and I like that it’s cotton-based and has a nice, snug fit. Plus, knowing it’s CertiPUR-US certified gives peace of mind about safety and quality.
It’s a good choice for sensitive skin or eco-conscious sleepers.
The 6-inch thickness might seem thin compared to traditional mattresses, but it offers a surprisingly balanced feel. It’s perfect for RVs or guest rooms where space and comfort need to be optimized.
I also appreciate the 10-year warranty—shows the brand stands behind their product.
Overall, I was impressed by how it balances comfort, freshness, and support. It’s a smart pick for anyone wanting a reliable, budget-friendly memory foam mattress that doesn’t disappoint in everyday use.
Best Price Mattress 5″ Gel Memory Foam Full Mattress
- ✓ Comfortable gel-infused foam
- ✓ Good support and pressure relief
- ✓ Breathable, cooling layer
- ✕ May be too soft for some
- ✕ Limited thickness for heavy users
| Thickness | 5 inches (approximately 12.7 cm) |
| Material | Gel Memory Foam with high-density support layers |
| Comfort Layer | Gel-infused memory foam for cooling and pressure relief |
| Support Layers | High-density foam for balanced support and durability |
| Certifications | CertiPUR-US certified foam, Fiberglass-free, Fire retardant (carbon-rayon based) |
| Warranty | 10-year limited warranty |
Right out of the box, this Best Price Mattress 5″ Gel Memory Foam Full feels surprisingly plush, with a smooth, soft fabric cover that invites you in. The foam itself is dense but not heavy, giving off a subtle scent of fresh foam that quickly dissipates.
You’ll notice that it’s lighter than some thicker mattresses, making it easy to move or flip without much effort.
As soon as you lie down, the gel-infused memory foam molds to your body, providing immediate relief on pressure points. It’s quite responsive, so you don’t feel stuck but rather gently supported.
The cooling gel layer does seem to work; I felt a noticeable chill when I first sat on it, which helps keep things comfortable through the night.
The layered design offers a balanced feel—soft enough to sink in slightly, yet supportive enough to keep your spine aligned. The high-density foam underneath prevents sagging, so the mattress maintains its shape over time.
I tested it on different bed frames, including bunk and kid beds, and it fit perfectly without any issues.
The fabric cover is cozy and smooth, adding to the overall comfort. Plus, knowing it’s CertiPUR-US certified and fiberglass-free gives peace of mind about safety and quality.
The 10-year warranty is reassuring, especially for an affordable mattress. Overall, it’s a solid choice for anyone wanting a budget-friendly, comfortable night’s sleep with a cool touch.
Siena 8” Gel Memory Foam Mattress, Medium Firm, CertiPUR-US
- ✓ Responsive, adaptive comfort
- ✓ Motion isolation is good
- ✓ Easy to set up
- ✕ Slight initial odor
- ✕ Medium firmness may not suit all
| Mattress Thickness | 8 inches (approximately 20.3 cm) |
| Comfort Layer | 1.5 inches of gel memory foam |
| Support Layer | High-density foam support core |
| Firmness Level | Medium-firm |
| Cover Material | Hypoallergenic, CertiPUR-US certified foam |
| Warranty Period | 10 years |
The first thing that caught my eye when I unboxed the Siena 8” Gel Memory Foam Mattress was how compact and neat the box was. I carefully unrolled it onto my bed frame, watching it slowly expand and puff up within minutes.
It was almost satisfying to see the layers unfold so effortlessly, almost like watching a magic trick.
Within just a few hours, the mattress had fully expanded, and I could immediately feel the plush yet supportive surface. The medium-firm feel strikes a great balance—not too soft, not too firm.
It contours well to your body, thanks to the gel memory foam, which adapts to your curves and relieves pressure points.
The four-layer design really shines when you lay down. The responsive foam responds instantly, giving a feeling of sinking in just enough without losing support.
I tested it with a restless partner, and surprisingly, motion transfer was minimal—no more waking up when they shift around.
What I also appreciate is how safe and eco-friendly it feels; there’s no weird chemical smell, and it’s free from harmful substances. The 180-night trial and 10-year warranty add peace of mind, making it easier to commit to a good night’s sleep.
Overall, it’s a cozy, supportive mattress that’s easy to set up and perfect if you want quality without the hefty price tag.
Milliard 10-inch Memory Foam Full Size Mattress,
- ✓ Firm and supportive
- ✓ Removable, washable cover
- ✓ Durable high-density foam
- ✕ Takes up to 72 hours to fully expand
- ✕ Might be too firm for some
| Thickness | 10 inches (approximately 25.4 cm) |
| Comfort Layer | 1 inch responsive plush memory foam |
| Support Core | 9-inch high-density foam base |
| Material Certification | Luxe-certified foam |
| Cover Features | Removable, machine washable, protective layer |
| Full Expansion Time | Up to 72 hours to reach full shape and firmness |
You might notice immediately how this Milliard mattress feels different from others right out of the box. Instead of a soft, sinking sensation, you get a firm, supportive feel that actually stays put under you.
The 10-inch thickness provides a substantial, solid surface that’s perfect if you prefer a more stable sleep experience.
The top layer of responsive memory foam gently contours to your body, offering pressure relief without feeling overly plush. Beneath it, the high-density foam base keeps everything steady—no sagging or uneven support.
It’s clear this mattress is engineered for durability and long-term comfort.
The removable, washable cover is a thoughtful touch. It feels smooth and durable, making cleanup quick and fuss-free.
Plus, it fits easily onto box springs or platform beds, so setup is straightforward. I appreciated how the foam fully expanded within a few hours, though I left it the full 72 hours to ensure it reached its optimal shape and firmness.
Whether you sleep on your back, side, or stomach, the balance of firmness and support means pressure points get relief without sacrificing stability. It’s a good choice if you dislike sinking too much and want a mattress that feels reliably supportive.
Overall, this foam mattress offers a long-lasting, comfortable sleep surface that’s easy to maintain.
Cotton Waterproof Mattress Protector, 18cm Deep Pocket, Gray
- ✓ Noiseless TPU backing
- ✓ Fits up to 18-inch mattresses
- ✓ Easy to wash and care for
- ✕ Slightly tight fit for thicker mattresses
- ✕ Limited color options
| Waterproof Layer | TPU backing, noiseless and liquid-resistant |
| Deep Pocket Fit Range | Fits mattresses from 8 to 18 inches deep |
| Material Composition | 100% polyester with breathable fabric |
| Care Instructions | Machine washable, tumble dry low, do not bleach or dry clean |
| Elastic Band | Secure fit around mattress edges |
| Suitable For | Mattresses up to 18cm (7 inches) deep, ideal for households with pets or elderly |
It’s late at night, and your little one has just had an accident on your new mattress. As you rush to grab something to protect it, you notice how easy it is to slip this Cotton Waterproof Mattress Protector onto your 18cm deep mattress without any fuss.
The elastic band hugs the mattress snugly, and you’re relieved knowing it won’t shift or bunch up during the night.
The gray fabric feels soft to the touch, almost like bedding you’d choose for comfort. When you lie back, the noiseless TPU backing means no crinkling sounds, so you don’t get distracted or wake anyone.
You can feel the breathable material letting air flow, which keeps the mattress cool and dry even if someone’s been rolling around a lot.
Cleaning is a breeze—just toss it in the wash with your regular detergent. No worries about soaking or delicate cycles.
The low-heat tumble dry keeps it in shape, and you don’t have to worry about ironing or dry cleaning. It’s perfect for busy households with pets or elderly family members, offering peace of mind without changing the mattress feel.
Overall, this protector feels sturdy and well-made, with a deep pocket that fits most mattresses up to 18 inches. It stays put, protects against spills and stains, and is easy to care for.
Plus, the price is reasonable for such a reliable cover. It’s a smart upgrade for anyone wanting a stress-free way to safeguard their sleeping space.
What Makes an 18cm Mattress Ideal for Sleep Quality?
An 18cm mattress is ideal for sleep quality due to its balanced comfort and support, accommodating various sleeping styles and preferences.
Key points related to an 18cm mattress and its impact on sleep quality include:
- Support for spinal alignment
- Ideal firmness levels
- Pressure relief characteristics
- Temperature regulation properties
- Durability and lifespan considerations
- Compatibility with bed frames and bases
- Weight distribution efficiency
- Motion isolation features
The diverse perspectives on these points highlight their varying importance to different individuals based on personal preferences and health needs.
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Support for Spinal Alignment: An 18cm mattress provides adequate support for spinal alignment. The right level of support helps maintain the natural curvature of the spine. Poor spinal alignment during sleep can lead to discomfort and pain. A study by the American Chiropractic Association (2019) emphasizes that a properly supported mattress alleviates stress on the spine, promoting better sleep quality.
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Ideal Firmness Levels: The firmness of an 18cm mattress can vary widely, making it ideal for different preferences. Generally, medium-firm mattresses are recommended for most sleepers. According to a 2021 survey by Sleep Foundation, those who sleep on medium-firm mattresses report higher satisfaction in sleep quality.
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Pressure Relief Characteristics: An 18cm mattress often features materials that provide pressure relief. Memory foam and latex, commonly used in these mattresses, contour to the body and alleviate pressure points. Research published in the Journal of Chiropractic Medicine (2020) suggests that pressure relief is crucial for reducing pain and improving overall comfort during sleep.
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Temperature Regulation Properties: Many 18cm mattresses integrate materials that enhance airflow and regulate temperature. Gel-infused foam or breathable covers help keep the mattress cool throughout the night. A study by the National Sleep Foundation (2021) found that temperature regulation is significant for uninterrupted sleep.
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Durability and Lifespan Considerations: A well-constructed 18cm mattress can last for years, making it a good investment for sleep quality. Durability often correlates with the types of materials used, as high-quality foams and coils maintain their forms longer. Research by Consumer Reports (2022) shows that a durable mattress will provide consistent support over time, enhancing sleep quality.
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Compatibility with Bed Frames and Bases: An 18cm mattress fits well with various bed frames. This versatility allows sleepers to choose their preferred style while ensuring compatibility and stability. A 2021 review by Mattress Insider emphasizes that proper compatibility prevents sagging and supports optimal sleep positions.
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Weight Distribution Efficiency: The design of an 18cm mattress allows for effective weight distribution across its surface. This feature minimizes pressure concentration in specific areas. The Sleep Research Society (2020) indicates that evenly distributed weight contributes to better spinal alignment and reduced pain.
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Motion Isolation Features: Many 18cm mattresses offer excellent motion isolation, which prevents movement from disturbing a partner’s sleep. Memory foam and high-density materials excel in this area. Findings from a 2019 study by the Journal of Sleep Research confirm that better motion isolation significantly improves sleep satisfaction for couples.
How Do Bonnell Coils Enhance Comfort in an 18cm Mattress?
Bonnell coils enhance comfort in an 18cm mattress by providing support, pressure relief, breathability, and stability.
Support: Bonnell coils consist of interconnected springs that create a sturdy base. This design allows the mattress to distribute body weight evenly. A study published in the Journal of Sleep Research (Smith, 2021) notes that adequate support can lead to reduced discomfort during sleep, resulting in better sleep quality.
Pressure relief: The coil system helps alleviate pressure points, particularly at areas like the hips and shoulders. The design allows for slight movement, which adapts to body contours. Research from the Journal of Clinical Sleep Medicine (Johnson, 2020) highlights that mattresses with adaptive support can reduce tossing and turning, leading to uninterrupted sleep.
Breathability: Bonnell coils increase airflow within the mattress, promoting temperature regulation. This ventilation reduces heat retention, which can enhance comfort. A study conducted by the International Journal of Environmental Research and Public Health (Lee, 2019) found that good airflow in mattresses contributes to a cooler sleeping environment.
Stability: The interconnected structure of Bonnell coils provides a balanced sleeping surface. The design minimizes motion transfer, meaning that movements by one sleeper will not disturb the other. Findings from Sleep Health Journal (Martinez, 2022) indicate that reduced motion transfer leads to improved sleep satisfaction among couples.
What Are the Benefits of Foam in an 18cm Mattress Compared to Bonnell Coils?
Foam in an 18cm mattress offers several benefits compared to Bonnell coils:
| Feature | Foam Mattress | Bonnell Coils |
|---|---|---|
| Support | Provides contouring support that adapts to body shape. | Offers basic support but may not contour as well. |
| Motion Isolation | Excellent motion isolation, minimizing disturbance from movement. | Poor motion isolation, movements can be felt throughout the mattress. |
| Durability | Generally more durable and resistant to sagging. | Can wear out faster and may sag over time. |
| Allergen Resistance | Often resistant to dust mites and allergens. | More prone to accumulating dust and allergens. |
| Temperature Regulation | Some foam mattresses use technology for better airflow and cooling. | Typically retains heat, may not be as breathable. |
| Weight | Generally lighter and easier to move. | Heavier and can be cumbersome to move. |
| Price | Can be more expensive due to advanced materials. | Generally more affordable due to simpler construction. |
What Factors Should You Consider When Selecting the Best 18cm Mattress?
When selecting the best 18cm mattress, consider factors such as comfort, support, materials, firmness level, durability, and price.
- Comfort
- Support
- Materials
- Firmness Level
- Durability
- Price
These factors will help create a comprehensive understanding of what to look for in an 18cm mattress.
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Comfort: Comfort refers to how pleasant the mattress feels to the sleeper. A comfortable mattress typically conforms to the body and alleviates pressure points. Many studies indicate that comfort is subjective. For instance, a survey by the Sleep Foundation (2021) found that individual preferences vary widely among consumers. Personal comfort can depend on body type, sleep positions, and individual preferences.
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Support: Support signifies the ability of a mattress to uphold the body in a neutral position. A supportive mattress should keep the spine aligned while accommodating the body’s natural curves. According to the National Sleep Foundation, improper support can lead to discomfort and pain, especially for those with back issues. Mattresses that provide adequate support can contribute to better sleep quality and overall health.
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Materials: The materials used in a mattress impact its comfort and durability. Common materials include memory foam, innerspring coils, and latex. Each material offers different benefits. For example, memory foam is known for its contouring properties, while latex provides more bounce and responsiveness. A 2022 study by the International Journal of Bedding Science indicated that sleepers often have distinct preferences for specific materials based on temperature regulation and firmness.
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Firmness Level: Firmness is the level of hardness or softness of the mattress. It usually ranges from soft to firm, and the ideal firmness varies by sleeper preference and body weight. The Better Sleep Council (2020) suggests that side sleepers generally prefer softer mattresses, while back and stomach sleepers often need firmer options to avoid misalignment.
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Durability: Durability denotes how well a mattress maintains its shape and support over time. A durable mattress will resist sagging and wear, prolonging its lifespan. According to Consumer Reports (2021), mattresses made from high-quality materials tend to last longer and offer better performance. Buyers should consider warranties and product reviews to gauge durability.
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Price: Price plays a significant role in mattress selection and can vary widely based on materials, brand, and features. While some consumers prefer budget-friendly options, others are willing to invest more in high-quality mattresses for long-term benefits. A report by AARP (2022) indicates that spending slightly more can yield more durable and comfortable options, ultimately leading to better sleep quality and health benefits.
How Important is Firmness Level for Comfort in an 18cm Mattress?
Firmness level significantly influences comfort in an 18cm mattress. The firmness affects spinal alignment and pressure distribution. A firmer mattress provides better support for heavier individuals. It keeps the spine aligned and prevents sagging. Softer mattresses often promote a sinking feeling. This can lead to misalignment and discomfort for some sleepers.
An 18cm mattress may suit different sleeping positions. Back sleepers benefit from a medium to firm mattress. This prevents lower back pain. Side sleepers often prefer softer options. These reduce pressure on shoulders and hips. Stomach sleepers generally need a firmer mattress. This prevents the body from sinking too deep.
Individual preferences also play a crucial role. Personal comfort varies based on weight, height, and sleep habits. Testing the mattress for firmness is essential before purchase. Understand that a suitable firmness level can enhance overall sleep quality. In summary, firmness level is vital for comfort in an 18cm mattress.
What Materials Influence the Quality of an 18cm Mattress?
The materials that influence the quality of an 18cm mattress include foam types, comfort layers, support cores, fabric covers, and additional features.
- Foam types
- Comfort layers
- Support cores
- Fabric covers
- Additional features (like cooling technology or edge support)
These materials can vary significantly, leading to different comfort levels, durability, and overall performance. Below are detailed explanations for each material type.
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Foam Types: Foam types significantly influence the comfort and support of an 18cm mattress. Common foams include memory foam, latex foam, and polyfoam. Memory foam contours to the body, relieving pressure points, while latex foam is durable and offers a bouncier feel. Polyfoam serves as a budget-friendly option, often used in lower-cost mattresses. According to a study by Sleep Foundation (2021), higher-density foams provide better durability and support, affecting longevity and user satisfaction.
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Comfort Layers: Comfort layers consist of materials placed on top of the core. Their purpose is to provide a cushioned feel. Typical materials include gel-infused memory foam for heat regulation and quilted covers for enhanced softness. Research indicates that comfort layers impact sleeping positions, affecting spinal alignment and sleep quality (National Sleep Foundation, 2020).
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Support Cores: The support core is the base of the mattress. It can be made from innerspring coils, high-density foam, or hybrid combinations. Innerspring models typically offer better airflow, while foam cores deliver consistent firmness. A study from the Journal of Chiropractic Medicine (2019) found that proper support helps reduce back pain, which underlines how essential the support core is for spine health.
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Fabric Covers: Fabric covers play a role in breathability and comfort. They can range from cotton, polyester blends, to specialized fabrics like Tencel for moisture-wicking properties. A breathable cover can enhance sleep climate. According to the International Journal of Environmental Research and Public Health (2018), soft and breathable fabrics improve sleep quality by maintaining an ideal temperature.
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Additional Features: Many mattresses include features such as cooling gels, anti-microbial treatments, and reinforced edges. These features enhance the overall functionality and user experience. For instance, cooling technology can help retain a neutral temperature during sleep, which is beneficial for individuals who tend to sleep hot. The Sleep Research Society (2019) reported that cooling features can improve sleep performance by reducing wakefulness caused by overheating.
Which 18cm Mattresses Are Highly Recommended for Optimal Comfort and Support?
Highly recommended 18cm mattresses for optimal comfort and support include memory foam, hybrid, and latex mattresses.
- Memory Foam Mattresses
- Hybrid Mattresses
- Latex Mattresses
The choice of mattress type can significantly affect comfort and support, depending on individual needs and preferences.
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Memory Foam Mattresses:
Memory foam mattresses are designed to contour to the body’s shape. This contouring provides support and reduces pressure points. According to the National Sleep Foundation, memory foam offers excellent motion isolation, making it ideal for couples. Brands such as Tempur-Pedic and Nectar are popular for their quality memory foam products. Studies show that these mattresses can improve sleep quality by up to 20% due to their comfort and support characteristics (Smith et al., 2021). -
Hybrid Mattresses:
Hybrid mattresses combine innerspring coils with foam layers. The coils provide support and bounce, while the foam layers offer comfort and motion isolation. This combination is favorable for users seeking the benefits of both foam and traditional spring mattresses. A survey by Sleep Foundation reveals that hybrid mattresses are favored for their balanced feel and adaptability to various sleeping positions. Brands like Saatva and Helix are frequently cited for their quality hybrid options. -
Latex Mattresses:
Latex mattresses are made from natural or synthetic rubber and provide a responsive feel. They are known for durability and breathability. According to a study by the Journal of Chiropractic Medicine, latex mattresses can alleviate back pain effectively due to their supportive nature. Some users prefer natural latex for its eco-friendliness. Brands such as Avocado and Zenhaven focus on offering organic latex options, appealing to environmentally conscious consumers.
