The Action Akton Centurian Cushion with Basic Cover is a combination Akton polymer gel pad and foam cushion that provides pressure and shear reduction. For active wheelchair users, this light to medium weight seat cushion provides cushioning and protection, and is ideal for the moderate risk user. The Action Akton Centurian Cushion with Basic Cover has combined layers of 5/8 inch Akton Polymer and 5/8 inch foam sealed in a waterproof film barrier for incontinence protection. This cushion offers significant comfort, and is also the first choice of long term care facilities for decubitus prevention and treatment. People using wheelchairs, power wheelchairs, scooters or in other situations that require prolonged sitting will find this cushion provides effective pressure relief. The Basic Cover is made of a durable stretch knit material which is essential for the user to benefit from the protective properties of the cushion. The soft black ponte fabric cover has a non skid bottom, zippers on 3 sides, and is easily removable for washing. The Centurian Cushion with Basic Cover measures 1-1/4 inches total thickness. Choose from the following sizes: 16W x 16D, 16W x 18D, 18W x 16D, 18W x 18D. Shipping via UPS Ground. This is a non-returnable hygiene item. Action Akton Centurian Cushion with Basic Cover Specifications: Thickness: 1-1/4 inches Sizes: 16W x 16D, 16W x 18 D, 18W x 16D, 18W x 18W, 20W x 20D. Material: 5/8 inch smooth Akton polymer pad, 5/8 inch foam base. Shipping: UPS Ground.