For correct sizing: Measure circumference of leg three (3") inches above top of knee cap. Small/Medium: Knee/Thigh 16" & under Large/XLarge: Knee/Thigh 16" & over Treat all aspects of the leg from top to bottom shins and calves. Great for all knee injuries, groin, hamstrings, quadriceps, IT band and more. The Active Wrap Cold Therapy System is one of the most popular cold therapy wraps in the USA. Comes complete with 2 Heat/Ice Packs and Compress Wrap. Continuous no-mess cold treatments are readily available by rotating the soft packs throughout the wrap. Active Wrap is non-toxic and patient safe. Our compress wraps are made of the finest quality medical plush material on the market and our latex free. Continuous no-mess cold treatments are readily available by rotating the packs in and out of the wrap as needed. Ice on the go! ActiveWrap's hot/cold packs also provide interval contrast heat and cold treatments, which can be very effective in the post-acute phase of injury. No pumps, no hoses, no motors, no recharge kits.