Smartwool Women's Hide And Seek Socks Ultra Light Cushion: Non-cushioned for maximum performance in close-fitting shoes Internal gripper at heel Sock Height: Hidden Knit in Korea: 77% Merino Wool, 21% Nylon, 2% Elastane Style: SW0SW705 Internal gripper at heel Sock Height: Hidden Ultra Light Cushion: Non-cushioned for maximum performance in close-fitting shoes Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.