Castelli womens nanoflex donna bibtightthis castelli womens nanoflex donna bibtight is ideal for colder conditions the bib straps improve comfort and provide protection to prevent cold spots the tight can protect you from light rain or drizzle thanks to the fleece lining this garment insulates very well and is also great on cool and dry days featuresnano flex fabric provides outstanding warmth and stretch with water resistance minimal seams for maximum water resistance kiss air donna seat