I slept on my first extra firm mattress and as a stomach sleeper, I love it — why I’d buy it in the Black Friday sales

Two people sit on top of the Plank Firm flippable double-sided mattress in a bedroom.

I've always preferred a mattress with a firmer feel, but the Plank Firm pushes that preference to the limit. It's unyielding, with the bare minimum cushioning. Like all the best firm mattresses, it creates incredible support — but does that come at the expense of pressure relief? Here's what I can tell you after two weeks of sleeping on it...

Plank Firm specs

Type: All-foam (flippable)
Materials: Support foam, comfort foam
Firmness (1-10): Firm (8) and extra firm (9)
Height: 9"
Trial period: 120 nights
Warranty: 10 years
Price (sale): From $524.30 at Plank Mattress