Compression & Cold Therapy in One Lumark is an effective Cold Compression Therapy system which consists of a cold gel pack that has been covered with a frost free lining to allow application directly to the skin. Each pack contains an adjustable chamber behind each cold pack to provide deep, cold compression around the site of the injury. The outer black material is a latex free type of neoprene completely covered in looped material to allow the velcro wraps to stick anywhere for your own comfort, inside the blue material feels like a heavy cotton type material that is specifically designed to be frost free and offer an ideal barrier between the ice cold gel pack and your delicate skin. For best results freeze for 2 hours before use and then apply to injured area for 10-15 minute periods. The inflation occurs from a detachable tubing and hand bulb, so you can inflate the cuff as much as is comfortable and fully adjust through the cold compression therapy process. Sizing Knee Wrap Size: 36cm x 32cm How to Use Place the cold blue cloth over your knee with your Patella (knee cap) protruding through the hole at the front, then wrap the two straps around your upper and lower leg to velcro back on itself. The cold area will keep the whole knee cool, and reduce inflammation from conditions like pulled or strained ligaments (any of the cruciate or collateral), twists, turns, tendonitis and arthritis.