Plank Firm Rx: firm support with layered cushioning
The Plank Firm Rx is a firm hybrid combining quilt and memory foams, microcoils and an individually encased coil support core. Plank describes it as a model designed for people looking for firm support with more pressure-conforming materials. Mattress comfort varies, and no mattress can guarantee relief from pain.
Inside the mattress
According to Plank, the mattress includes these layers from top to bottom:
- Quilt foam: 1 inch. Surface cushioning with a firm feel.
- Memory quilt foam: 0.75 inch. Contouring near the sleep surface.
- Microcoils: 0.75 inch. Small coils designed to respond to pressure.
- High-density memory foam: 1 inch. A contouring comfort layer.
- VariFlex™ transition foam: 0.75 inch. A responsive transition into the support core.
- Foam-encased 1,200-series coils: 8 inches. Individually encased coils with a reinforced perimeter.
- Base foam: 0.75 inch. A foundation beneath the coil unit.
An optional GlacioTex cooling cover is available. These are manufacturer specifications; configurations can change.
Who might like it?
- Sleepers who prefer a firm hybrid but want memory foam and microcoils in the comfort layers.
- Shoppers who like the idea of a reinforced perimeter and an individually encased coil core.
- People comparing a more layered firm hybrid with Plank’s simpler Essential model.
If a very firm mattress creates pressure at your shoulders or hips, consider a more cushioned option. For persistent pain or a medical condition, discuss your sleep needs with your clinician.
How does Firm Rx compare?
The Plank Essential is a more streamlined extra-firm foam-and-coil mattress. The Luxe Zoned offers two firm sides and zoned center foam. Firm Rx adds memory foam and microcoils to its hybrid construction.
Frequently asked questions
Does Firm Rx contain memory foam?
Yes. Plank lists memory quilt foam and high-density memory foam in its construction.
Does Firm Rx have coils?
Yes. It includes a microcoil comfort layer and an individually encased coil support core.
Is the cooling cover included?
GlacioTex is optional. Select the cover option and mattress size above to see the corresponding price.
Cooling cover and sizes
The optional GlacioTex™ cover is designed to feel cool to the touch. It is a passive cooling material, not a powered temperature-control system. Choose a size and whether you want the cover above to see the price for that configuration.
Trial and ordering
Yawnder offers a 100-night mattress trial, subject to a 30-night break-in period and a $200 return fee. One return or exchange is available per customer or household. Review our full return policy for details and exclusions. Selecting the optional trial waiver makes the sale final; see the option above for its terms. Manufacturer-direct terms can differ.
Have questions about size, delivery, foundation compatibility, or whether a model is available to try? Contact our Encinitas showroom.
Product construction and specifications below are based on Plank’s published information; these newer models have not been confirmed as hands-on tested by Yawnder. Comfort varies by sleeper.
