From SmartWool, these ankle socks feature: Low ankle height Zero cushion Indestructawool™ technology with extended durability zones 4 Degree™ elite fit system for a dialed-in, performance-oriented fit Mesh zones for added breathability Shred Shield™ technology reduces wear from toes Virtually Seamless™ toe for enhanced comfort Achilles tab prevents sock from slipping into footwear Merino wool/nylon/recycled nylon/elastane One size fits men's shoe sizes 9-13 Machine wash/tumble dry Made in the USA.