Castelli 3t pro bibshortcastellis 3t pro bib shorts are made of affinity lycra fabric which provides outstanding stretch and rebound for an exceptional fit and comfort they feature giro single layer sublimation printed leg endings which grip the legs securely mesh bib straps for added breathability and castellis kiss air seat pad for all day comfort featuresaffinity lycra fabricgiro single layer sublimation printed leg endingmesh bib strapskiss air seat padtechnologieskiss air the kis