The Giro Thermal Leg Warmer combines warm fabric with a 3-panel fit design that is articulated to stay in place and not bunch up behind your knees as you ride. There is silicone found on the thigh and ankle to help keep the warmers in place throughout your pedal stroke. Perfect for chilly mornings before the sun comes out, the Giro Thermal Leg Warmers can be easily removed and stored away without taking up much space. The ankle zipper is reflective to help keep you visible in low lighting conditions. The warmers are offered in sizes SM-LG. Please refer to the attached sizing chart to help determine the best fit for you.