Perform with the power and comfort of responsibly sourced, ZQ-certified Merino wool in the Hike Light Cushion Crew socks by SMARTWOOL. Formerly known as PhD® Outdoor and newly updated, these socks include more sustainable materials with the addition of recycled nylon, improved durability, updated mesh zones, and an even more perfect fit. SMARTWOOL continues to offer fan-favourite sock technologies that give you the comfort and performance that you expect. The crew height also adds extra coverage on the trails and light cushioning on the entire bottom of foot helps keep you comfortable when the ground isn't—helping you to hike on (and on.. and on..)