Maximum insulation and comfort. The Giro Merino Winter sock is made from a heavy-weight Merino Wool which keeps in the warmth and pushes perspiration out. This soft Merino wool is also naturally breathable and antibacterial so the Winter Sock doesn’t overheat easily effectively resists odor and feels great against the skin. Mid foot support band and high rise 5.5 cuff to fit under tights and leg warmers.