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Castelli Nanoflex Bibtights
Castelli's Nanoflex water-repellent fabric is one of those fabrics that seems miraculous. On a dry day it's as warm and breathable as their normal Thermoflex fabric, but when it rains the water just runs off, thanks to the five-phase nanotechnology treatment. They've used an innovative construction that minimizes seams to keep you as dry as possible. While it's not 100% waterproof, it's the best solution they've ever tried for staying comfortable in any condition.