The Fortuna Neoprene Knee Srabiliser is made from high quality neoprene rubber that provides constant uniform compression & support. It also generates & retains warmth that increases blood circulation to the injured area, thus promoting natural healing & comfort. In addition, the warming effects on muscles & joints increase flexibility to help prevent sporting injuries. Product Code: FT-SN-014 Small FT-SN-015 Medium FT-SN-016 Large FT-SN-017 Extra Large. Measure around centre of knee: Small: 32-36cm Medium: 36-39cm Large: 39.5-43.5cm X-Large: 43.5-47.5cm