The OS1st IT3 Performance IT Band helps treat iliotibial band syndrome and related pain so you can stay active and keep your training on track. Using a comfortable hypoallergenic gel support system that keeps the sleeve in place during your workout, the IT3 easily slips on and off and has a thin profile that you can wear under your running clothes. Details: Designed to target conditions like ITBS (Iliotibial Band Syndrome) and upper lateral knee stress Advanced patent pending medical device for ITB Syndrome and leg fatigue Easy-on fit for continuous support Soft, moisture-wicking fabric Medical Grade Support Wear comfortably under all apparel while exercising for extra protection and injury prevention Patented Compression Zone Technology® Sized and shaped to fit for ultimate performance