FALKE Men's Tk2 Trekking Sock 40% Polypropylene, 28% Acrylic, 22% Wool, 9% Polyamide, 1% Elastane Imported Pull On closure Machine Wash Temperature regulating and cushioned Trek sock Merino wool mixture for good thermal insulation Perfect temperature and moisture transport thanks to triple-layered structure Anatomically knit with patented left and right foot cushioning Lay flat to dry