This is a sock but it has a lifetime warranty. The wool socks brand is a wool sock that is sure to provide the comfort and durability of Merino wool. Designed, tested, produced and shipped from Mills in Northfield, Vermont, USA. The DARN TOUGH Darn Tough Womens 1903 Micro Crew Midweight Cushion features Merino Wool with DARN TOUGH VERMONT Socks proprietary knitting technology that provides high cushioning and shock absorption. The upper ankle features a non-skid living area for a proper fit. Elastic arch support provides comfort for long hours and long hikes, and durability is Darn Tough. Suitable for activities TRUE SEAMLESS (Ring Knit Toe Construction): The ultra-flexible and tightly woven terry loop construction makes the toe part seamless for a comfortable wear. Care instructions: To preserve the life of the Darn Tough socks, turn the sock inside out, and use a limited temperature of 40 Degree C, and wash it in a gentle cycle. Do not bleach or dry clean. Tumble dry low.