The Knee: Active support is designed to be worn during activity to:The Active Support is made from a 3mm high density fabric ,(90% neoprene rubber, 10% nylon polyester), that is stiff without restricting the bodys natural movements.The unique shape ensures that the support remains fixed in position during activity, thus protecting the knee from further injury and allowing for longer periods of activity without pain.Provide heavy duty support to the knee.Reducing the risk of further injury.Bringing confidence to allow for longer periods of sustained exercise, without experiencing knee pain.Getting back to fitness more quickly.One size: 9.5" to 17.25" (24.2 cm to 43.7 cm). Measured circumference round mid section of the knee when standing.