T-TRAIL is the specific sock for long-duration activities such as trail and ultra trail. It provides improved support of all biomechanical functions related to the foot and leg, heel, Achilles tendon and calf. It thus guarantees protection from injuries and wear and tear on the body over long distances, increased speed of recovery after competition and training, and increased resistance to exertion. It also helps in the pushing and unloading phase and increases stability, even on rough terrain, improving performance and decreasing the possibility of abrasions and micro-traumas.