Simms&'; Lightweight Baselayer Bottom is the essential next-to-skin layer for building a rock-solid foundation that prioritizes all-day mobility, warmth and wicking. Quick-dry, jersey knit polyester combined with sustainable odor control for maximum next-to-skin comfort Flat elastic waistband and fly pouch designed with minimal seams for a chafe-free, next to skin comfort Flatlock seam construction for next to skin comfort FABRIC TECH: Body - 192 gsm 92% spun polyester, 8% spandex finished with HeiQ Fresh odor control + HeiQ Speed DryITEM #: PG-13311