Sidas Trail Double socks are trail running socks for long-distance mountain running. They offer runners optimum foot protection with double construction to reduce blisters. Designed in collaboration with international athletes, they feature anatomical right and left foot construction for better protection and a more precise fit. What's more, Polygiène fibers limit the risk of bacterial growth and odor in the sock. Underfoot, a light, airy mesh keeps feet cool and ventilates them better. Protective zones are strategically placed around the heel and toes for greater comfort on impact with the ground. A grip strip has also been placed around the instep to improve grip on the ground and in the shoe.