The legs present a sometimes difficult task of optimizing skin temperature. You'll want to insulate the muscles to keep them warm and to ensure enough blood flow to prevent injury, yet you'll build up considerable body heat as you pedal. So you need the right amount of insulation -- too thin and your legs will remain cold, too thick and the bunching behind the knees is more annoying than you care to endure. This is the reason that De Marchi stitches their Contour Leg Warmers from Thermolite Roubaix fabric.De Marchi's Thermolite Roubaix fabric uses hollow fibers for maximum heat retention with minimal bulk. It has a fleecy softness to it for ultimate comfort against your skin. True to their name, the Contour Leg Warmers are cut to fit the shape of your legs as you pedal. To do this De Marchi makes them with multiple panels. There are seams on the inside and behind the knees that use a flatlocked construction that all but makes them disappear. The articulated shape helps reduce bunching behind the knee. The De Marchi Contour Leg Warmers are Black and come in three unisex sizes -- Small, Medium, and Large. The upper hem has an elastic cuff with a silicone gripper strip to keep them from sliding down as you ride.