Your first layer of defense in the battle against the brrrrr, the lightweight Strata 160 Bottom keeps you warm, mobile, and ready to fish in a naturally inviting, temperature-regulating wool and synthetic fabric blend. 4-way stretch polyester knit with wool for warmth and moisture management Low-profile flatlock stitched seams for next-to-skin comfort Comfortable elastic waistband Treated with wicking and quick-dry finish Treated with an anti-microbial finish which prevents odor build-up Fabric Tech: Main: 92% POLYESTER, 8% WOOL stretch knit; Gusset and Back Yoke: 92% POLYESTER, 8% Elastane Stretch Jacquard Mesh