Castelli nano flex 3g legwarmerthe castelli nano flex 3g legwarmers provide versatile weather protection, keeping your legs warm in cool temperatures and should rain arrive the nanoparticle and dwr finish prevents water soaking in. If you're racing or training in changeable conditions it can be difficult to decide whether to cover the legs or not. The nano flex 3g legwarmers takes the guesswork out, meaning you get the best of both worlds. For cooler and damp conditions slip them on to provide extra warmth and wet weather protection but should the clouds break and sun show up then they're easy to take off and stow in a back pocket. They're the ideal companion to your thermal winter bib shorts. This 3rd generation of nano flex is better than ever, with extra warmth, a tighter weave and nanotechnology microfilament mechanical water repellent finish combined with a short chain chemical dwr finish for class leading water repellency. Castelli's nano flex warmers are often copied but never bettered. Featuresmaterial 85% polyamide, 15% elastane3rd generation nano flex water repellency nano particle and dwr finishtighter weave for more water protectionimproved thermal protectionsuggested temperature range 8 to 18 degrees cbuy castelli clothing from chain reaction cycles. The world's largest online bike store.