An astonishing 25% of all the bones in the human body are in the feet, along with 33 joints and 100+ muscles. With all those moving parts, it’s no wonder most socks slip, chafe and bunch! But SmartWool® PhD® Performance Socks are scientifically constructed to give you a higher degree of comfort and performance. Rich in naturally moisture-wicking, temperature-regulating Merino wool, they feature a Virtually Seamless™ toe and 4 Degree™ elite fit system that lets the sock flex smoothly with the foot. Indestructawool™ technology prevents the fabric from thinning prematurely in wear-prone areas. There’s even an Achilles strap for extra cushioning at the back of the ankle. Treat your feet to the hiking socks that let you forget what you’re wearing and focus on the trail ahead. Because you’ve got miles to go, and you couldn’t be happier.