The Össur Formfit Pro Knee is a lightweight, highly breathable compression sleeve for people suffering from knee pain. This support provides realignment of the patella, compression and support. Can be used for mild strains/sprains, general knee pain, patella tendinitis, feeling of instability and chondromalacia. effective treatment and management of a knee injury can aid recovery and help prevent re-injury.SizeCalf Thigh Small31-36cm41-46cmMedium36-41cm46-51cmLarge41-46cm51-56cmX-Large46-50cm56-60cm