Nordic skiers-they're not big complainers and neither is this sock. After all, skiing a 50k Nordic race requires a special kind of toughness. Darn Tough Nordic Boot is an Ultra-Light, Merino Wool sock with the long haul in mind. It's ideal for vigorous winter excursions like snowshoeing and cross-country skiing. And since Merino Wool is naturally antimicrobial this sock repels bacteria and odor. Simply put it's a great winter sock for any activity. Always warm, always breathable, always ready to drop some K's. Still made in Vermont. Guaranteed for life. Merino Wool - Darn Tough custom count, shrink treated Merino wool enhances the comfort and durability that outdoor enthusiasts have come to expect from this fiber. True Seamless - Using the latest generation of Italian knitting machines, Darn Tough are able to knit ultra-light yet extremely dense socks with an undetectable toe seam, here in Vermont. The result is miles and miles (and miles) of blister-free bliss. Feel the difference of feeling nothing at all!