Features of the Castelli Men's Sorpasso 2 Bibknicker For a wide range of cool to cold conditions Thermoflex Core2 front and knees for extra warmth Thermoflex over tHighs and back of legs for extra stretch Castelli shadow wordmark in colored leg band 3D support band at lower back and flat bib straps for extra comfort Progetto X2 Air seat pad for long-distance rides