Smartwool Run Zero Cushion Low Ankle - Women's Low Cut Socks Shoes : Black : The primary materials that compose this product contain a minimum of 20 percent recycled content. Upgrade your sock drawer with the Smartwool Run Zero Cushion Low Ankle Socks. 4 Degree elite fit system makes for a performance oriented fit. Shred Shield technology reduces wear from toes. Body-mapped mesh zones for added breathability. Indestructawool technology for enhanced durability. Micro sock height. Achilles tab designed to prevent sock from slipping down into footwear. 46% merino wool, 29% nylon, 22% recycled nylon, 3% elastane. Machine wash, tumble dry. Made in the USA.