Ultralight?no cushion for maximum performance next to the foot. New 4 Degree Elite Fit System with bi-elastic construction across four fit bands improves fit and comfort with faster flex and recovery?four-point support at ankle, upper and lower instep, and arch to keep the sock in place. ReliaWool technology in high-impact areas provides longer lasting durability and protection to keep feet comfortable. * Soft, breathable merino wool regulates temperature, manages moisture, naturally resists odor, and does not itch or shrink. Mesh ventilation zones for temperature and moisture regulation. Low-profile and durable virtually seamless toe. * Alternating 1x1 welt. Overall height: 1.5 in.. Machine wash warm inside out, gentle cycle; tumble dry low.