Castelli nano flex 3g kneewarmerthe castelli nano flex 3g kneewarmers provide versatile weather protection, keeping your knees warm in cool temperatures and should rain arrive the nanoparticle and dwr finish prevents water soaking in'. '.strtoupper('i')f you're racing or training in changeable conditions it can be difficult to decide whether to cover the legs or not'. '.strtoupper('t')he nano flex 3g kneewarmers takes the guesswork out, meaning you get the best of both worlds'. '.strtoupper('f')or 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'. '.strtoupper('t')hey're the ideal companion to your thermal winter bib shorts'. '.strtoupper('t')his 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'. '.strtoupper('c')astelli's nano flex warmers are often copied but never bettered'. '.strtoupper('f')eaturesmaterial 85% polyamide, 15% elastane3rd generation nano flex water repellency nano particle and dwr finishtighter weave for more water protectionimproved thermal protectionsuggested temperature range 12 to 20 degrees cbuy castelli clothing from chain reaction cycles'. '.strtoupper('t')he world's largest online bike store.