Double-sock technology has reduced the chances of developing blisters to almost zero, even during sustained periods of physical activity. During the summer months, the probability of developing blisters is at its highest. Even shoes that fit well cannot guarantee blister-free feet because during extended periods of activity, the foot heats up, perspires, and swells. Moisture is the most frequent cause of blisters because skin that remains damp for long periods loses its natural elasticity. It only takes a few minutes of movement for a blister to form. X-SOCKS® with the “Sock-in-a-Sock System” are designed to deliver the best possible moisture regulation and the highest reduction of friction possible. The fine-knit net sock in direct contact with the skin functions as a buffer zone. It transports perspiration away from the skin to the exterior layer of the sock, where it quickly evaporates. Friction generated as a result of the movement of the foot in the shoe is absorbed between the two layers. The risk of scraping, bruising and blistering diminishes dramatically.