The Tru Form comfort cushion features 4 lbs. of Visco foam that contours to the users body to provide maximum skin protection. The three layer foam construction sandwiches the Visco Memory Foam between 2 layers of HR Foam for maximum pressure relief and protection from bottoming out. A "waterfall" front eliminates pressure points in the leg trough, and the Kwik Strap features an easy-to-operate buckle that easily and safely secures the cushion to the chair. Available in 3" or 4" thickness.