Given the long hours that real base miles require, your winter gear ought to be at least as comfortable as the stuff you ride and race in during the peak of your season. The pad should remain comfortable over the course of a five hour ride. The materials should feature little bulk while maintaining body heat so you don't feel like a first grader bundled up for a winter's walk to school. The Castelli Sorpasso Bib Knickers are part of Castelli's Rosso Corsa line of products, and as a result they get the Italian manufacturer's very best treatment in materials, design, and fit. The Sorpasso Bib Knickers begin with Castelli's top of the line Progetto X2 pad, the same pad found in Castelli's best shorts. The top layer that contacts your skin is a made from a seamless, four way stretch microdenier fabric designed to move in harmony with your body and eliminate the chafing that can come with materials with too little stretch. It receives an antibacterial treatment and is bonded to a variable thickness pad made from multiple density foams the result is a smoothly contoured pad that places the firmest foam where support is most needed. Perforated inserts help to relieve pressure on the sit bones and perineum just where riders experience the greatest pressure. The front of the knickers are cut from wind blocking Thermoflex Core Due fabric. This two layer material traps air in a hollow core layer of polyester while moisture is transported to the outer nylonLycra layer where it can evaporate. A lighter material, Thermoflex, is used for the portions of the tights not exposed to the wind to offer excellent breathability. Giro grippers keep both the bib straps and calves in place. It's rare to find knickers that are this light and this warm. Like the bibs in the Rosso Corsa line, the waist of the Sorpasso Bib Knickers is cut very low to eliminate restrictions on breathing caused by pressure on the belly. The Castelli Sorpasso Bib knickers are Blackwhite and are available...