Castelli Nano Flex+ Leg Warmer

It sometimes takes a bit of self encouragement to get out the door and start a ride in the drizzle, so the last thing you need is a pair of leg warmers soaking up the rain and making you colder or slipping down to expose bare skin. Kit up in a pair of Castelli's Nano Flex Leg Warmers to stay warm, dry, and motivated through those chilly, dreary miles. Nano Flex starts its life the warm, stretchy Thermoflex fabric used in many of Castelli's winter pieces. It then gains an outer coating of tiny nanofilaments of silicone fiber that create a water repellent barrier so raindrops and road spray dead up and run off without soaking through. Despite its water resistant finish, Nano Flex fabric remains highly breathable, keeping you comfortable even when rain falls in the low 60s. Across the back, Castelli utilizes a panel of its lighter Nano Light fabric to increase stretchiness behind your knee for full freedom of motion without reducing protection from the elements. In our experience, the previous generation of Nano Flex warmers do bunch slightly behind the knee. This isn't necessarily a ride ending calamity, but the addition of Nano Light reduces that effect for more pleasant spinning in damp weather. Silicone grippers on both faces of the thigh hem and the inner face of the ankle hem keep the warmers in place to ensure there isn't a gap in coverage.