Wolfbike Sport Football Basketball Cycling Stretch Leg Warmer Knee Guard Long Sleeve Windproof Covers. Please measure your thigh size before ordering polyester Elastic Stretchy, Comfortable, Durable and Lightweight The Leg Warmers combines high quality thermal fleece with anatomic construction to keep your leg knee warmer in cold weather Gear designed and constructed to fit perfectly to the body in motion Ideal for Cycling, basketball, football, golf and other sport activities How to Measure: Measure the circumference in the middle part of your thigh with a tape measure.