The castelli nanoflex 2 bib shorts are designed to offer an outstanding aerodynamic performance temperature regulation and muscle compression in even the worst and wettest weather conditions crafted from castellis purposefully engineered nano flex fabric the bib shorts use millions of tiny nanofilaments that resist moisture and allow the rain to simply fall off you as you ride the nanoflex 2 bib shorts are fitted with a kiss air seat pad which features a multi density foam filling and