Thermoflex 2 Knee WarmersThe Castelli Thermoflex Knee warmers are made with soft, fleecy, luxurious fabric. They have a high stretch to give a more aerodynamic fit. They will make a good addition to your winter cycling wardrobe. The fleece inside traps the warm air next to your skin keeping your legs warm over winter. The silicon grippers will prevent the garments from slipping. These handy knee warmers can be discarded during a ride when you warm up, and rolled up neatly to