Turn Inside Out-Machine Wash-Liquid Fabric Softner is Recommended This is the sock that built Thorlos heritage as the original activity specific sock Features Thorlo legendary padding in the heel and forefoot Fibers are chosen for performance and durability resulting in a sock that wears for years. Exclusive Thor-Lon fibers wick moisture to keep your feet dry Fibers are chosen for performance and durability resulting in a sock that wears for years