Heavyweight men’s merino wool base layer bottoms for highly aerobic days in cold weather, the 260 Zone Leggings feature zoned ventilation panels for active temperature regulation and ample breathability. Fabric Solid: 260gm2 Jersey, 97% Merino Wool, 3% LYCRA. Fabric Mesh: 180gm2 Eyelet, 98% Merino Wool, 1% LYCRA, 1% Nylon. Fabric Insert: 215gm2 Waffle, 100% Merino Wool. BodyFitZone - features breathable zones for high intensity activity. Gusset for mobility and comfort. Flatlock seams to prevent friction. Slim fit.