Icebreaker Size Chart Midweight baselayer bottoms with optimized venting zones for active performance, the Men's Winter Zone Leggings are Icebreaker's most technical cold-weather leggings. Fully functional for warmth, ventilation, and support while alpine climbing, backcountry skiing, or other day-long adventures in the wild, the body features 260gm merino wool fabric with a touch of LYCRA(R) for stretch. In the gusset they used lightweight, 180gm eyelet merino mesh that actively controls temperature during high-output pursuits, and in the higher-wear areas around the knees we added 230gm merino and polyester waffle jersey for added abrasion resistance. Flatlock seams throughout eliminate chafing during fast-paced days. Features: - Icebreaker BodyfitZONE(R), zoned panels for warmth and breathability - Flatlock seams prevent chafing - Fabric Weight: 260 Midweight - Fabric: Body: 97% Merino Wool, 3% LYCRA(R) Panels: 78% Merino Wool, 22% Polyester - Discontinued Style / Colorway