WSM is a thick, high trekking winter sock made of double-layer.plush containing merino wool, which is a unique natural material, thus providing excellent thermal insulation and moisture removing properties. A simple instep bond improves foot ventilation and overall heat balance.foot and shin portion are reinforced with three-layer.plush knit, which provide comfort when walking and long durability of the most stressed areas.Elastic is fitted around the in ankle area. 85% MERINO, 10% SILTEX, 5% LYCRA.Features:Superfine Merino, Australian farms guarantee the ethical treatment of sheeps, Odourless, breathable.Composition:70% Merino Wool, 13% Polyamide, 10% Siltex, 7% Elastane.