Nordic skiing demands a special kind of toughness. The Lars Nordic Boot sock is a lightweight Merino Wool sock built with the long haul in mind. It's ideal for vigorous winter excursions, from snowshoeing to cross country skiing. With half the wool yarn weight of Darn Tough's cushion socks, this Light Cushion model delivers featherweight performance with the perfect amount of cushioning along the base of your foot. All Darn Tough Ski socks have Merino wool, reinforced heel and toe, and ring toe construction for a comfortable invisible seam. These socks are truly tough and the company backs up its word with an unconditional lifetime guarantee.