Quick verdict
Yawnder reviews · Updated October 2026
The Plank Firm is a flippable all-foam mattress made for people who deliberately want a firm surface. In our original review, both sides felt firm and one was even firmer. The current Plank Firm follows that same two-sided concept, while the separate Plank Firm Luxe uses a hybrid coil core.
My original Plank mattress test
Brooklyn Bedding supplied the original Plank for my review. At the time, it was the firmest mattress I had slept on. I did not find it uncomfortable, but it is a very specific feel: even the less-firm side kept me largely on top rather than deeply cradled in the foam.
The original sample was easy to move around on and showed very little sink in my photos. I also reported low motion transfer, an appealing combination for people who want a firm surface without much disturbance from a partner. These are observations of the older sample, not a new standardized test of today's version.
Watch our original Plank review video → · How Yawnder tests mattresses
Construction and the two sides
The original review covered an all-foam design with a thin quilted surface on each side and a firm support core. The more cushioned side had an additional comfort layer. The original construction image below documents the mattress we reviewed; it should not be treated as a diagram of every current model.
The manufacturer currently describes the Plank Firm as a 10-inch flippable all-foam mattress with firm and extra-firm sides and an optional cooling cover. See the current product specifications for the exact layers and options.
Plank Firm vs. Plank Firm Luxe
| Model | Current construction | Who may prefer it |
|---|---|---|
| Plank Firm | 10-inch, flippable all-foam design. | Someone who wants a firm foam surface and minimal bounce. |
| Plank Firm Luxe | 12-inch, flippable hybrid with a coil core. | Someone who wants to compare a responsive spring feel while staying in the firm range. |
Both are designed to be firm, but the original test on this page is of the older all-foam Plank. Do not assume the Luxe will feel identical.
Who should consider Plank?
Back and stomach sleepers: If you already know you like a firm mattress, the relatively flat surface may be a good starting point. Check that the surface supports your hips without feeling uncomfortable at the lower back.
Side sleepers: I generally would not pick my original sample for dedicated side sleeping because its limited cushioning could create pressure at the shoulder and hip. Body size and preference matter, so try both sides if possible.
Combination sleepers: I found the original easy to move on because I did not sink deeply. If you enjoy a slow memory-foam hug, you may prefer another bed.
Motion, cooling and edge feel
I noticed little motion transfer in the original foam model, but no mattress eliminates movement for every couple. I also found that limited sink left less material around my body. That observation is not an overnight temperature measurement: room temperature, sheets and the optional cover can change the experience.
Test the edge if you sit there to put on shoes or sleep near the perimeter. The all-foam Firm and coil-based Luxe can feel different, and our older review does not establish a current standardized edge score.
Price, trial and warranty
Prices and promotions change by size and configuration. The manufacturer currently advertises a 365-night trial and limited lifetime warranty for direct purchases. Check current return eligibility, any required break-in period and seller-specific terms before ordering; the older trial terms in historical reviews may no longer apply.
Frequently asked questions
Can you flip the Plank Firm?
Yes. The current all-foam Firm has two sleeping surfaces, described by the manufacturer as firm and extra firm.
Is Plank Firm Luxe all foam?
No. The current Luxe is a hybrid with coils, while the standard Firm uses an all-foam core.
Does a firmer mattress automatically help back pain?
No mattress guarantees pain relief. Comfort and support are individual, and firmness that is too hard can be uncomfortable for some sleepers.
Disclosure: Brooklyn Bedding supplied our original review mattress. Yawnder may earn a commission from the shopping link at no additional cost to you.
Standardized test data
Every mattress in the current program follows the same rubric and order, combining instrument-measured categories with hands-on evaluations so scores are comparable across brands.
| Measurement | Result | How to read it |
|---|---|---|
| Firmness | 9 | 1–10 scale (6.5 = medium-firm) |
| Construction | Foam | Foam / hybrid / latex / airbed |
| Profile height (manufacturer spec) | 10" | inches — as advertised by the brand |
| Profile height (Yawnder measured) | Not measured | inches — measured on our own sample |
| Motion transfer | 8.7 | score /10 — higher is less disturbance |
| Edge support | 8.3 | score /10 — sitting and sleeping edge |
| Temperature | 9.2 | score /10 — higher sleeps cooler |
| Pressure relief | 7.8 | score /10 — shoulder and hip |
| Spine alignment | 9.2 | score /10 — neutral posture |
| Ease of movement | 9.2 | score /10 — repositioning speed |
| Expected durability | 8.7 | score /10 — projected 5-year hold |
| Off-gassing | 8 | score /10 — higher is less smell |
| Queen price | $1,099 | MSRP before seasonal discounts |
| Manufacturer sleep trial | 120 nights | when bought direct from the brand |
| Manufacturer warranty | Limited Lifetime | as published by the manufacturer; applies wherever you buy |
| Last test date | August 26, 2026 | date of our most recent standardized test session |
How this score is built
Support and spine alignment 25% · pressure relief 20% · temperature 15% · motion transfer 15% · edge support 10% · durability 10% · value 5%. Scores come from standardized instrument measurements and structured hands-on evaluations using the same Yawnder testing rubric. Read the full rubric.
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Use Yawnder's standardized test data to compare this mattress with other models, or answer a few questions and narrow the field by sleep position, feel and priorities.
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Compare this mattress against 142 tested mattresses
Sort all 142 mattresses we have tested by pressure relief, support, cooling, motion isolation, edge support, price, trial and warranty, then filter by how you actually sleep. Of those, 86 hold a complete standardized record and 41 a partial standardized record.