These socks are USA made in manly Vermont. The climate and rugged surroundings serve as a terrific proving grounds for Darn Tough's Premium All Weather Performance Socks. High Density Knitting equates to superior durability and cushioning without bulk. Performance Fit from form fitting toe boxes to sculpted heel pockets and knit-in elastic support at the arch. Twenty-one micron, fine gauge, custom count, shrink treated, Merino Wool raises the bar for comfort and durability. When not using Merino Wool, Darn Tough utilizes an Exclusive Coolmax Blend to create a sock with exceptional softness, durability and superior moisture management.