For sleepers who can never find a mattress firm enough, the Plank delivers an ultra-firmer, flatter, flippable surface, creating a neutral spine position that’s better for your back and posture overall. Inspired by the minimalist approach to sleep in the Far East, our dual comfort design offers two variations: the top side of the mattress is standard firm; the bottom side is ultra-firm, allowing for an easily flippable, highly customizable sleep. Engineered to reduce pressure on your circulatory system the Plank provides for better blood flow—and better lower back support, compelling you to inhale more oxygen while you snooze.