The Jay Basic Seat Wheelchair Cushion is a fluid-resistant foam seat cover. Features Molded foam provides mild contouring for increased sitting tolerance and postural stability Beveled to fit between the seat rails on wheelchairs with seat upholstery, while providing a level support surface The cover is nylon lined with semi-plastic material to make it incontinence-resistant WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov The Jay Basic seat cushion by Sunrise Medical comes in various sizes from 14" wide to 22" wide. This non-inflatable foam cushion has a fluid-resistant cover, is black in color, and beveled to fit between seat rails on wheelchairs.