The 2XU Arm Sleeve uses seamless, circular knit construction to create the ultimate graduated arm sleeve for the forearm and bicep. Using 250 denier fabric, the arm sleeve encases the entire length of the arm, applying a graduated pressure to increase circulation and support the muscles and tendons in the forearm, elbow and bicep.ACTIVE USE, Running/Hiking, Gym/Fitness, General Sports, Climbing, Training and CompeitionsRECOVERY USE, Post Workout or Competition, Rehab from Injury or Surgery.