Simms Strata 160 LS Crew Dark Grey HeatherYour first layer of defense in the battle against the brrrrr, the lightweight Strata 160 LS crew 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 Raglan sleeve construction for ease of movement, breathability and comfort when layering with other clothing Low profile flatlock stitched seams for next to skin