Some winter tights may keep you warm, but rarely do they keep you both warm and dry. The Castelli Nanoflex Bib Tights break the mold by effectively doing both. By adding a proprietary, water-resistant coating to one of Castelli's most warming fabrics, the Nanoflex bib tights offer an all-winter edge that will keep you out pedaling.The Castelli Nanoflex Bib Tights are made from the Castelli exclusive Nanoflex fabric. Nanoflex is a water-resistant version of Castelli's ultra-warming Thermoflex fabric. The transformation process occurs when the Thermoflex fabric is coated with millions of nanofilaments to create a water-repellant surface. Water beads and slides when it comes in contact with Nanoflex, and all the while, the Nanoflex Bib Tights retain their warmth and wind-blocking prowess. Besides protecting you from rain and snow, the Nanoflex Bib Tights give you the benefit of having lightweight, stretchy bib tights that warm like a light jacket on your legs and fit like you're off to the races. The Nanoflex also features a fleecy inner-lining that traps a layer of warm air on your skin while it wicks away moisture to the quick-drying Nanoflex surface. This process provides a consistent warmth and dryness that you'll appreciate when it's in the 40s. The Nanoflex adds extra comfort by incorporating breathable mesh bib straps and the Kiss 3 pad. The Kiss chamois uses a seamless construction of brushed microfiber to avoid any chafing, and the pad is anatomically shaped to follow your movements. The Kiss 3 also features a variable density design with more padding where you need it and less where you don't.The Castelli Nanoflex Bib Tights are available in six sizes from Small to XXX-Large, and in the color Black.