The Pearl Izumi Elite Thermal Knee Warmer is one-of-a-kind knee warmer that is perfect for enhancing those cooler days where you really want to work up a sweat. Thermal Fleece fabric with water-shedding PI Dry technology for all-weather performance. Anatomic construction eliminates bunching through your full range of motion. Plush wide elastic binding with silicone gripper for a stay-up fit. BioViz reflective elements for low-light visibility. 56% recycled nylon, 30% polyester, 14% LYCRA elastane. Machine washable.