Our #1 selling budget futon mattress. With 2 inches of solid 1.2 density foam sanwiched between our 100% all natural cotton batting, this 8" mattress gives you three layers of cotton surrounding 2 layers of foam hence, Triple Double. An outstanding value that works great for any for any bi-fold futon frame, it provides you with a medium firm feel by combining the firm support of cotton with the resiliency of foam,