With an intelligent 4 Degree Elite fit system and strategic cushioning, the PHD V2 Snowboard Medium Socks offer the mid weight warmth and lasting comfort you need to carve the mountains from dawn until dusk. 4 Degree Elite fit system using two elastics for greater stretch and recovery and to keep the sock in place . Patented ReliaWool technology in high impact areas for long wear, protection, and comfort. Medium padding in shin, ball of foot, and heel area for comfort and protection. Flat knit durable toe seam for strength. Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management. Over the calf height.