Firm Quilted Sleep Surface
A .75 in quilted top with 2 in of Supreme Response comfort foam beneath it creates the firm side of the flippable design.
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Plank Firm Mattress
$561.75
$749.00
Save $187.25
Pay with HSA/FSA funds*
For qualified customers through Truemed. Tax savings vary.
Learn how it worksShipping calculated at checkout.
The Plank Firm is a 10-inch flippable all-foam mattress with a firm quilted surface on one side and an extra-firm surface on the other. A high-density foam core provides sturdy support for sleepers who prefer a flatter, firmer feel.
Choose Twin, Twin XL, Full, Queen, King, or California King, with the standard quilted surface or an optional GlacioTex Cooling Cover sewn onto both sleep surfaces. Select your size and cooling-cover option before adding to cart.
- Flip the two-sided design between firm and extra-firm quilted surfaces to dial in your preferred firmness level.
- A 6-inch high-density foam core keeps the spine level, giving back and stomach sleepers plank-like support.
- CertiPUR-US certified foams and GREENGUARD Gold certification back this simple, durable all-foam build.
Quantity
- Mattress height
- 10 in
- Sleep type
- Back and stomach sleepers; Sleepers who want the firmest possible feel
- Mattress type
- All-Foam Mattress
- Comfort feel
- Extra Firm
Firmness Scale
9.5
- 1–3 Plush
- 3–4 Medium Plush
- 4–6 Medium
- 6–8 Medium Firm
- 8–9 Firm
- 9–10 Extra Firm
Under Bed Solutions
Top of Bed Solutions
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Subtotal
$561.75
$749.00
Save $187.25
Need help deciding?
Make sure this is the right fit.
Use the mattress selector, compare brands, or visit a SleepCity showroom for hands-on comfort guidance before you choose.
Certifications
Certifications
Certification details vary by brand and model. A SleepCity expert can help confirm materials, foams, and manufacturer-backed claims for this exact product before you purchase.
Delivery & Returns
Delivery & Returns
SleepCity serves Southeast Texas and Southwest Louisiana with local delivery on selected mattress purchases. We will confirm delivery timing, setup options and pickup availability before checkout. All sales are final; no refunds. Qualifying mattresses delivered within our regular local delivery areas may be eligible for one comfort exchange within 120 nights, after a minimum 30-night break-in period. A $249 exchange fee applies. See our Return & Comfort Guarantee Policy for all eligibility requirements and exclusions.
Outside our local delivery area? Call (903) 747-8270 for delivery options.
Warranty
Warranty
Warranty coverage is provided by the manufacturer and varies by product. SleepCity can help compare coverage, confirm what is included, and point you to the right registration details.
Why SleepCity?
Why SleepCity?
SleepCity pairs trusted mattress brands with local showroom guidance, financing help, and delivery support, so the experience stays clear from selection through setup.
Inside the Plank Firm
See how Plank Firm combines a firm quilted sleep surface, a high-density foam core, and an extra-firm quilted flip side to shape its comfort, cooling, and support.
View full-size diagram
Comfort & support details
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High-Density Foam Core
6 in of high-density base foam anchors both sleep surfaces for durable, plank-style support. -
Extra-Firm Quilted Flip Side
A .75 in quilted bottom panel with continuous stitching serves as the extra-firm sleep surface when flipped.
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