- The primary materials that compose this product contain a minimum of 20 percent recycled content. - Add the Smartwool® Run Zero Cushion Low Ankle socks to your outdoor gear and stay comfortable while running and working out. - Indestructawool™ is engineered to provide maximum comfort and durability. - 4-Degree™ Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. - Virtually Seamless™ toe is designed for all day comfort and to minimize chafing. - Shred Shield™ reduces wear and tear on the toes for added durability. - Mesh panels on the out step help provide added breathability. - Achilles strap helps give you added protection and warmth. - Low-cut design. - Contrasting detail on the heel and toe. - Pull-on style. - Branding detail on the toe. - Style #SW001651039. - 50% merino wool, 25% nylon, 21% recycled nylon, 4% elastane. - Machine wash, tumble dry. - Made in the USA.