This Castelli Women’s Nanoflex Donna Bibtight is ideal for colder conditions. The bib straps improve comfort and provide protection to prevent cold spots. The tight can protect you from light rain or drizzle. Thanks to the fleece lining, this garment insulates very well and is also great on cool and dry days Features:Nano Flex fabric provides outstanding warmth and stretch with water resistance Minimal seams for maximum water resistance KISS Air Donna seat pad for all-day comfort Reflective screen-printed Castelli graphic on both legs GIRO3 ankle grippers lie flat and seal around shoecover YKK ® ankle Camlock zippers with reflective tape for high visibilityWeight: 347g (small)Technologies: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.