Swiftwick One Vibe Black/Red/Grey, M - Men's THE BEST SOCK YOU'LL EVER WEAR - Plush feel, fun color accents, and a perfect fit. Utilizing state of the art fiber technology, managing compression and moisture, and offering a range of sizes, the Vibe One is a high-performance low-rise sock loaded with MADE FROM OLEFIN BLEND FABRIC - Olefin fabric is the only Nobel prize winning fiber. It retains less than 0.01% of its weight in moisture and resists deterioration caused by natural perspiration and harsh detergents. By utilizing olefin with a T-66 nylon FEATURES SCULPTURED TOE AND FOOTBED - Designed for serious runners and cyclists but useful for all active lifestyles and pursuits, our sculptured footbed adheres to your foot perfectly while our seamless toe design prevents blisters by eliminating bunchi INCLUDES MANAGED COMPRESSION TECHNOLOGY - With Managed Compression technology, these socks eliminate bunching and hot spots by supporting all 3 arches of the foot and are proven to reduce swelling, improve circulation, and even increase endurance. PRODUCT SPECIFICATIONS - Package includes (1) pair of Swiftwick Vibe One Socks. Recommended use: running, cycling, and other athletic activities. Includes manufacture's lifetime warranty. Made in the U.S.A.