Smartwool Mens Heathered Rib 3-Pair Pack Merino^Nylon^Spandex Made in USA The Heathered Rib sock by Smartwool&reg; is guaranteed to make you look and feel good as soon as you slip them on. Wow Technology&trade; is featured in the reinforced sole for excellent comfort and durability. Built-in cushioned comfort. Ribbed detail for a classic look. Materials: 71% Merino wool, 27% nylon and 2% elastane. Machine wash warm and tumble dry low. Comes in a 3-pair pack. Made in the USA and imported.