Perfect for trail and fell running, as well as mountain biking. The 1000 Mile Trail Sock is anatomically designed to give comfort and support during your off-rroad running and racing. The padded heel extends to protect the achilles tendon, toes and ball of the foot. Specially selected merino wool blends help reduce friction, wick moisture and dry quickly, and has natural anti-bacterial qualities. Arch bracing provides a customised fit with no slippage. Ventilation zones allow the foot to breathe and maintain an even temperature..