Elastic Knee Stabilizer Beige X Large 16.5 18 Foam Mattresses Two way stretch top enables the Impotence Two way stretch top enables the cushion cells to conform to the individual's body shape without diminishing product effectiveness or therapeutic value * The cover has a two way 100% Polyester top material that is a durable heavyweight fabric with a soft feel * The side material is composed of a 3 layered knit spacer fabric which provides superior air circulation that ventilates and cools the user * The fluid proof solid non skid base material offers a durable easy to clean surface * The cover has the added feature of Velcro© straps placed on the bottom to allow the user to attach the cushion to their chair * Encased foam is stitched to the cover for added comfort around the leg trough areas * Cover is machine washable * Weight: 1 Easy one touch operation * Compact and lightweight * One year battery and three year compressor warranty * Fast treatment time about 10 minutes * 45 minute battery life * The 4 hour battery charge time * Includes Compressor Unit Battery Reusable nebulizer with tubing Disposable nebulizer 5 replacement air filters and filter door Tubing adapter Adult and pediatric masks AC adapter DC car adapter Carrying case Instructional manual & DVD * 5 18 (measurement taken just under the knee cap while knee is slightly bent) * Elastic Support for Prevention Treatment & Rehabilitation of the knee * Thermoskin elastics can expand contract and stretch and are made of a high grade durable material that permits a full range of movement and are comfortable to wear during a range of activities * Anatomically designed the elastic support will comfortably contour to the shape of your knee * It provides even compression and support to weakened and injured knees * It has side stabilizers to provide increased medial and laterial support X Large * Fits knee circum