The castelli nanoflex pro bib tights 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 tights use millions of tiny nanofilaments that resist moisture and allow the rain to simply fall off you as you ride the nanoflex pro bib tights are fitted with a progetto x air seat pad which features a multi density foam f