Imported. Drynamix Polyester 91%/Polyamide 7%/Elastane 2%. U.S. made Drynamix moisture management fibers Non constricting compression bands Sensitive rib top and extra deep heel pocket Mesh construction for added ventilation; cushioning for impact resistance Medium volume construction As you put in some serious miles, keep your feet comfortable in the Balega Enduro V-Tech Crew Running Sock. Equipped with Balega's signature V-Tech Arch Support System, these socks keep your midfoot and heel securely in place while leaving room for your toes to move to help prevent heel blistering. The toe is also seamless to help remove hot spots. As the run gets longer and longer, the mesh ventilation panels and the Drynamix fabric keep your feet cool and dry for a comfortable environment in your shoes. The crew length is ideal for trail running and is held in place by non-constricting compression bands so as you run you won't have to continually pull your socks up.