The has gone from merely awesome to perfect. This lightweight wind protector features Gore® Windstopper® X-Lite Plus on the front and shoulders and Nano Flex Light on the back to provide superior protection from wheel spray Features:Gore® Windstopper® X-Lite Plus on front and shoulders provides lightweight wind protectionNano Flex Light fabric on back protects from wheel sprayPackable constructionFull-length YKK® Vislon zipper with wind flap2 rear pocketsReflective trim on back for visibilityWeight: 192g (large)Technologies:Windstopper X-lite: The highly stretchable Windstopper X-lite fabric moves naturally with your body and doesn’t restrict movement. It also delivers 100% wind protection and up to ten times greater breathability compared to other windproof fabrics Nano Flex: Exclusively engineered by Castelli, NanoFlex consists of Thermoflex fabric with millions of tiny silicone nanofilaments on the surface to create the most water-repellent finish ever. In wet conditions, water droplets simply bounce off the fabric without leaving a trace. The silicone nanofilaments also trap a layer of air between them for excellent insulation and prevent water from soaking through to the fabric underneath. In dry conditions, Nanoflex provides the same warmth and feel of regular thermoflex fabric. NanoFlex is not completely waterproof but maintains full stretch, breathability and freedom of movement for weatherproof protection with un-compromised performance in all conditions Buy Castelli Clothing from Chain Reaction Cycles, the World's Largest Online Bike Store.