Castelli Nanoflex+ Armwarmer Using Castelli's water-resistant thermal and breathable Nanoflex fabric, thes arm warmers are the perfect accent for cold rides. When you want something light for added warmth, these are the perfect choice. A nano light insert on the back provides added stretch, to deliver a great fit. Double sided silicone grippers prevent shifting while riding. At just 69 grams, you can't go wrong with the Nanoflex+ Armwarmers. Features Water resistant to keep your arms warm and dry Nano light inserts provide a perfect fit Lightweight comfort with silicone grippers to prevent shifting | Castelli Nanoflex+ Cycling Arm Warmers Men's Size Small in Black