Our Nano Flex water-repellent fabric is one of those fabrics that seems miraculous. On a dry day its as warm & breathable as our normal Thermoflex fabric but when it rains the water just runs off thanks to the five phase nanotechology treatment. While its not 100% waterproof its the best soloution we have ever tried for staying comfortable in any conditions. On a wet day pair the Nano Flex bibshort with our Nano Flex knee or leg warmers for the same level of warmth & protection as you would get with tights. Nanoflex fabric provides outstanding warmth & stretch with water resistance. Kiss 3 pad for all-day comfort. Giro 3 single layer engineered leg gripper. Mesh bib straps for breathability Screen-printed Castelli logos on both legs 2 rear reflective tabs labels. Weight 159g