Introducing EXPERIA X Speed, designed and made in the U.S.A by the world's best sock engineers. This premium collection of running socks offers performance, durability, comfort and fit. Created with a unique X design to support the arch, X Speed is engineered to perform. X Speed features Rocket Grip Technology around the inside of the cuff. This grip technology prevents the sock from sliding into the shoe. Powered by Ionic+ Technology, X Speed is engineered to release Silver Ions in the presence of moisture vapor, delivering anti-microbial benefits and reducing odors.