Made from 5mm thick neoprene, Rehbands RX knee sleeves deliver consistent support with a unique level of flexibility. This allows any athletefrom Crossfitters to Strongman competitorsto tear through a regimen without discomfort or a restriction of movement. Whether youre dealing with regular knee pain, recovering from an injury, or looking to prevent one, Rehband Knee Supports supply joint compression and warmth to promote better blood flow and reduce the direct strain on the knees during squats, Oly lifts, etc. Keep the knee slightly bent (about 30 degrees) and measure the circumference (cm) around the leg, 10 cm below the patella Small 33cm - 35cm Medium 35cm - 37cm Large 37cm - 39cm