The Outdoor Sport Ultra-Light Mini Sock features SmartWool's 4-Degree Fit System, which secures the sock in place for exceptional performance and fit. The reinforced heel and toe provide enhanced durability for long-lasting wear. The 1 x 1 double-ribbed, double-layered cuff and flat-knit toe seam help keep feet comfortable throughout the day. This ultra-light, non-cushioned mini sock is made from a rugged blend of 56% New Zealand Zque Merino wool, 41% nylon, and 3% elastane fabric. Made in the USA.