Our 7mm thick neoprene knee sleeve is designed to help reduce knee strain during workouts without restricting range of motion. These knee sleeves are well made and protect your knee joint while doing heavy lifting or any weight-bearing workout. Never worn brand new. These run really small. circumference around knee joint: 9" calf: 12" length is 10 1/2" SX runs more like an XXS Questions ? Please ask below.