The Outdoor Sport 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. The light, half-cushioned micro sock is made from a rugged blend of 65% New Zealand Zque Merino wool, 34% nylon, and 1% elastane fabric. Made in the USA.