We put more into our socks so you can get more out of them. The heel and toe of our Invincible Extra Wool-Blend Crew Socks, the two most wear-prone areas, are designed to survive 20,000 abrasion cycles in laboratory testing. Made in Vermont of the finest merino wool for softness, moisture management, and odour control, and blended with polyamide and elastane for strength, durability, and resiliency to make our socks the best you can buy. A special 1x1 rib knit eliminates bunching and breakdown. 70% merino wool/26% polyamide/4% elastane. Washable. Made in USA. Fits US shoe sizes M(8-9 1/2, L(10-11 1/2, XL(12-13 1/2. Midcalf length.