This memory foam wedge elevates your legs to improve blood circulation, helping to relieve lower back pain, leg cramps, and muscle spasms as you lie supine. Unlike a stack of pillows that requires repeated readjustment and does not provide proper support, the unit has an insert that adjusts from 5" to 9" high and a memory foam surface that contours to the shape of your legs, ensuring proper, constant support throughout the night. The hypoallergenic leg support quickly reverts to its original shape when not in use, ensuring it will neither sag nor settle. The washable antimicrobial cover is made of breathable Coolmax that wicks away moisture. 11" H x 20" W x 25" L. (2 lbs.)