NWT Bombas Men's Marl Calf Socks Size Large 9.5-13 Marked Charcoal Classic colors, Marl yarn twist. Borrowing a centuries-old technique from scarves and sweaters, we knit two yarns together to make a new beautiful multi-textured mega-color. We call them, Marls. As always, one purchased = one donated. Features Cushioned Footbed Seamless Toe Y-Stitched Heel Honeycomb Arch Support Stay-Up Technology Extra-Long Staple Cotton Full Fabric Content Calf Socks : 70% Cotton (Supima®) 26% Polyester 4% Elastane Marl Calf Socks 4-Pack : (1) 70% Cotton (Supima®) 26% Polyester 4% Elastane ; (2) 69% Cotton 27% Polyester 3% Rubber 1% Spandex Imported Care Details Machine wash cold on gentle cycle, Only non-chlorine bleach when needed, Tumble dry low, Do not Iron, Do not dryclean