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Plank Firm Mattress Review: Is It Right for Side Sleepers?
The Plank Firm is a flippable mattress with two firmness levels: a firm side and an extra-firm side. It suits back and stomach sleepers who want support, but side sleepers may find it too hard. Its standout trait is the dual-sided design, offering customization in one bed.
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The Plank Firm is a well-built, durable mattress, but its firmness is a poor match for most side sleepers. Choose it only if you prefer an ultra-firm feel and sleep primarily on your back or stomach. Side sleepers should look for a softer model with pressure relief.
How it scores
The good and the annoying
- Flippable design offers two firmness levels in one mattress.
- High-density foam and coil construction promise durability.
- Excellent edge support for sitting or sleeping near the edge.
- Minimal motion transfer, good for couples.
- Too firm for most side sleepers, causing pressure on hips and shoulders.
- Heavy and difficult to flip or move.
- No built-in pillow top or plush comfort layer.
The Plank Firm is a flippable mattress with two firmness levels: a firm side and an extra-firm side. It suits back and stomach sleepers who want support, but side sleepers may find it too hard. Its standout trait is the dual-sided design, offering customization in one bed.
What to Look For in a Mattress for Side Sleepers
Side sleepers need a mattress that cushions the shoulders and hips, where pressure points form. A medium-soft to medium firmness, around 4 to 6 on the firmness scale, is typically ideal. Look for materials like memory foam or latex that contour to the body. Hybrid designs with a comfort layer over coils can offer both pressure relief and support. Always check the trial period and warranty to ensure you can test it at home.
How Firmness Affects Side Sleepers
Firmness is a key factor for side sleepers. A mattress that is too firm creates pressure points, leading to discomfort and restless sleep. Conversely, a very soft mattress may not provide enough support, causing spinal misalignment. The Plank Firm's firm side is rated 7/10, which is on the firmer end. Most side sleepers find this uncomfortable, as it does not contour adequately. The extra-firm side is even harder, making it unsuitable for side sleeping.
The Plank Firm's Construction and Materials
The Plank Firm is a hybrid mattress with a layer of high-density foam over a coil support core. The cover is made from a breathable, stretchable fabric. The coils are individually wrapped, which helps with motion isolation and edge support. The foam layers are designed to be durable and resistant to sagging. This construction is typical for a firm mattress, prioritizing support over plushness.
Specs that matter
| Type | Hybrid (foam and coils) |
| Firmness | Firm (7/10) and Extra Firm (9/10) |
| Thickness | 10.5 inches |
| Trial | 120 nights |
| Warranty | 10 years |
| Shipping | Free, compressed in a box |
Buy the Plank Firm if you are a back or stomach sleeper who prefers a very firm surface and wants the option to flip for extra firmness.
Skip the Plank Firm if you are a side sleeper who needs pressure relief at the hips and shoulders, or if you prefer a plush or medium feel.
Questions before you buy
Is the Plank Firm good for side sleepers?
No, the Plank Firm is generally too firm for side sleepers. Its firm side (7/10) and extra-firm side (9/10) do not provide enough pressure relief for hips and shoulders, which can lead to discomfort.
What firmness is the Plank Firm?
The Plank Firm has two sides: a firm side rated about 7/10 and an extra-firm side rated about 9/10 on the firmness scale.
Can you flip the Plank Firm mattress?
Yes, the Plank Firm is flippable. You can choose between the firm and extra-firm sides by flipping the mattress.
How thick is the Plank Firm?
The Plank Firm is 10.5 inches thick, which is a standard profile for a hybrid mattress.
Does the Plank Firm have good edge support?
Yes, the individually wrapped coils provide strong edge support, making it easier to sit or sleep near the edge without sagging.
What is the trial period for the Plank Firm?
The Plank Firm comes with a 120-night trial, allowing you to test it at home. If it doesn't work out, you can return it for a refund.
What warranty does the Plank Firm offer?
The Plank Firm includes a 10-year limited warranty that covers manufacturing defects.
