Plank Firm 2-Sided Mattress
Best firm mattress for sleepers prioritizing spinal alignment and durability.
Experience unparalleled firmness with the Plank™ Firm 2-Sided Mattress, engineered for those who demand exceptional spinal support. This all-foam mattress delivers the firmest feel available, promoting optimal alignment and preventing discomfort. Its innovative flippable design offers two firmness options – firm or medium-firm – extending the mattress's lifespan. Crafted with high-density, open-cell foams, it ensures breathability and lasting comfort. An optional GlacioTex™ cooling cover can be added for enhanced temperature regulation. Proudly assembled in the USA, this mattress is built for restorative sleep.
$524.30
Owner Satisfaction
4.6
/ 5
Category Rank
271
/ 6845
#271 in Mattresses
Price vs Category Average
-68%
Below average
Thickness
10.25
/ inches
Who it's for
- Back and stomach sleepers needing rigid spinal alignment
- Value-conscious shoppers seeking a longer-lasting mattress investment
- Firmness seekers who find standard mattresses too soft
Who should skip it
- Side sleepers prone to hip or shoulder pressure pain
- Lightweight individuals or those preferring a plush sleep surface
- Solo sleepers who struggle to lift heavy furniture
Performance breakdown
Spinal Alignment
ACA endorsement confirms superior support for healthy sleep posture.
Firmness Versatility
Flippable design offers two distinct levels of high-density support.
Material Durability
High-density foam construction ensures long-term structural integrity.
Temperature Regulation
Open-cell foam breathes well, though cooling cover is highly recommended.
Motion Isolation
All-foam build effectively dampens movement for undisturbed rest.
Edge Support
Solid enough for stability, though lacks reinforced perimeter edge coils.
Key Specs
Thickness
10.25 inches
Flippable
Yes (Firm or Medium-Firm)
Assembly
Assembled in the USA
Warranty
10-Year Manufacturer Warranty
Material
High Density All-foam
Cooling Technology
Ventilated Foam, Optional Cooling Fabric Cover
Firmness Levels
Extra Firm, Medium Firm
Mattress Construction
Memory Foam
Features
- 2-Sided Flippable Design
- Extra Firm Support (10/10)
- ACA Endorsed for Spinal Alignment
- High-Density All-Foam Construction
- Breathable Open-Cell Technology
- Optional Cooling Cover Upgrade
- Designed for Optimal Spinal Alignment
- 10-Year Manufacturer Warranty
What customers say
The Plank Firm 2 Sided Mattress is celebrated for its exceptional firmness, a key feature for those seeking robust support. Back and stomach sleepers frequently report significant relief from back pain, directly crediting the mattress's unyielding structure. Consumers appreciate that it genuinely delivers on its ultra firm promise, setting it apart from other firm options. The dual sided design offers versatility, allowing users to choose between an ultra firm and a slightly less firm surface, enhancing perceived value and longevity. Many reviewers note the high quality construction, finding the mattress durable and well made, which justifies the investment. While side sleepers may find it too rigid, the Plank Firm excels for individuals prioritizing extreme firmness and stability.
Know before you buy
The Plank Firm is flippable, offering an 'Extra Firm' side (rated 10/10) and a 'Medium Firm' side. You can simply flip the mattress to switch between these two feels depending on your comfort preference.
Yes, this mattress is specifically engineered for spinal alignment, making it an excellent choice for back and stomach sleepers who require a firmer surface to prevent the hips from sinking and to maintain a neutral spine.
The mattress uses high-density, open-cell foam designed to promote airflow and prevent heat buildup. For those who sleep particularly hot, there is also an optional GlacioTex cooling cover available to further regulate surface temperature.
The American Chiropractic Association (ACA) endorsement signifies that the mattress meets specific standards for promoting healthy spinal alignment. This helps reduce pressure points and minimizes discomfort for those who prioritize back health.
Being able to rotate and flip the mattress allows for more even wear across the foam layers over time. This helps prevent permanent body impressions and extends the overall lifespan of the mattress compared to non-flippable models.
Because this is a high-density foam mattress, it performs best on a solid, flat surface or a slatted base with slats spaced no more than 3 inches apart. This ensures the foam is properly supported and prevents sagging.
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$524