Sit and Rise Easier with the Extra Large Easy Rise Seat Cushion. Comfortable 5" thick foam cushion gives you a helpful boost. Works in most chairs or wheelchairs. Machine wash, removable cover. Soft, poly-shearling top with cotton-knit sides and bottom. Booster cushion measures 15 1/2" x 18". Please measure the intended sitting space to ensure a proper fit before buying. Made in USA. Please note, this regular firm foam for seat boosting purposes, and not memory foam.