These SK-5 bamboo socks from FXD are an ideal everyday wear for anybody who is on the feet all day. Designed for use by tradesmen and for long periods of wear underneath boots, these socks are extra long with padded foot beds and heals and built in arch support. Very thick and comfortable socks. Comes in a two pack. Made from 89.6% Bamboo, 8.9% nylon and 1.5% elastane.