WSB 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. Material: 85% Merino Wool, 10% Siltex, 5% Lycra