mont-bell Merino Wool Trekking High Socks These socks use 51% high-insulation merino wool. They are very warm, and my daughter used them for skiing, snowboarding, and winter camping. There is some pilling and fraying. Please refrain from purchasing if you are concerned. ▼Size▼ 17-19 cm ▼Material▼ Wool 51% Acrylic 20% Nylon 14% Polyester 14% Polyurethane 1%