Designed for year-round performance, the Simms Lightweight Baselayer Bottom utilizes the latest technology in the textile industry to provide anglers with a warm yet breathable baselayer. Made with an uber-comfortable blend of polyester and spandex, the Simms Lightweight Baselayer Bottom delivers ample warmth and maximum mobility. The Simms Lightweight Baselayer Bottom also comes equipped with HeiQ Speed Dry and HeiQ Fresh odor control, which are both sustainable thanks to their fully bio-based composition. Complete with a flatlock seam construction for next-to-skin comfort, the Simms Lightweight Baselayer Bottom is an ideal solution for chilly mornings and brisk evenings out on the water. -HeiQ Fresh odor control -HeiQ Speed Dry-Flatlock seam construction-Flat elastic waistband-Fly pouch