What Our Gearhead® Experts Are Saying:"I’ve worn these under everything from insulated pants to shell bibs on big winter days—super soft, never itchy, and they keep my temp just right even when I’m working hard in the cold."When the temps drop and layering becomes a science, we turn to the Bergtagen Merino 190 LJ M for breathable, itch-free warmth that keeps us moving. These lightweight baselayer bottoms are made from 100% traceable merino wool, delivering soft next-to-skin comfort that stays warm even when damp and resists odors naturally. The fine jersey knit construction offers a stretchy, flexible feel, with a gusseted crotch and elastic waistband for a secure fit that moves with us on alpine ascents, skin tracks, and chilly campsite mornings. Designed for performance layering, this is our go-to bottom layer when we need warmth without bulk or overheating.