The Castelli Nanoflex 3G Kneewarmers provide excellent protection in cold and wet conditions while remaining effective in dry weather. They are crafted from water-repellent, thermal, and breathable Nano Flex fabric, ensuring warmth and comfort during rides. The design features flat-lock stitching with a single seam and double-sided silicone grippers to keep the warmers securely in place. Weighing only 89 grams, they offer a snug fit with substantial warmth and protection.