The aktivlex knee pillow is very comfortable and helpful for those with spinal complaints after knee and hip joint operations through the knee pad the hip and knee lie straight reducing the pain the cushion responds to pressure and heat the cover is detachable 100 polyester and 30 c washable without fastening tape measurements 25 x 20 x 137 cm material description the viscoelastic material aktivlex was originally developed by nasa for the astronauts to improve protection agai