Castelli Men's Entry Wind Bibtight Cycling Bib Shorts Autumn/Winter Collection with GORE-TEX INFINIUM WINDSTOPPER These tights are designed for great warmth, while everything else is almost simple. The front is totally windproof thanks to the AirFlex Thermo fabric, which features an elastic polyurethane membrane that keeps the wind away, but still remains elastic enough to move with you. The inside of the fabric is thick and brushed to add extra warmth. We built the back with our Nano Flex 3G fabric, which has a tight mesh to block some of the wind, allowing us to avoid a membrane that would inhibit breathability. The fabric is treated with our nanotechnology water repellent finishes, so road splashes will stay out. Other details are Castelli's functional standards, including the comfortable KISS Air2 seat pad, mesh braces and Camlock ankle zips. For when you just want the best warmth. The Entrance is entirely covered on the front by our AirFlex brushed windproof fabric, with the 3G Nano Flex on the back, keeping cold wind and road splashes away.