The 2XU Compression Calf Guards may appear simple but they are strategically designed to be exceptionally effective for the containment of the calf muscle when training and competing. Repeated muscle vibration is directly related to causing fatigue, muscle damage (small tears) and shin splints. The convenience of the calf guards allow the athlete to use their preferred sock and can also be worn under a wetsuit making transition times faster during a triathlon.ACTIVE USE, Running, Endurance Activities, Workout Sessions, Competitions and Racing, General Sporting Activities.