Fitted 10" TradewindsTM open patella design reduces direct pressure while providing enhanced stabilization to knee cap Non-snagging Mauser taped seams for smooth comfort, strength and durability Flexible, low profile design fits smoothly beneath pants Offers supportive fit without the heat, itching or sweating caused beneath non-breathable neoprenes Fully lined, easy slip-on and -off, evenly distributes compression and support This knee brace by body glove is made from neoprene, the same material used in wet suits. There is a reasonable amount of elasticity which allows for a snug yet comfortable fit. Fully lined, easy slip-on and -off, evenly distributes compression and support. Outside color is black, inside color is blue. Sizing Chart: Measure leg circumference at a point 3" above center of patella (knee cap). Please note that the sizing chart measurements are to be used as a guide only and may not be exact. Small 13"-14" Medium 14"-15" Large 15"-17" X-Large 17"-19"