Perform with the power and comfort of responsibly sourced, ZQ-certified Merino wool in our Hike Light Cushion Crew socks. Formerly known as PhD® Outdoor, we've updated our best hike socks to include more sustainable materials with the addition of recycled nylon, improved durability, updated mesh zones, and an even more perfect fit. Features: Model: SW001614 Color: Charcoal (003) 56% Merino wool / 11% nylon / 31% recycled nylon / 2% elastane Sock Height - Crew: Comes up to the mid-calf to fit above the boot without being too high Indesctructawool technology with extended durability zones 4 Degree elite fit system for a dialed-in, performance-oriented fit Additional body-mapped mesh zones for added breathability Virtually Seamless toe for enhance comfort Comfort welt with 'stay put' fit 8-inch sock height Light Cushion - Cushioning on the entire bottom of the foot Sizing: Medium - Men's Shoes 6-8.5, Women's Shoe 7-9.5 Large - Men's Shoes 9-11.5, Women's Shoes 10-12.5 X-Large - Men's Shoes 12-14.5, Women's Shoes 12.5+