The 2XU Calf G Under Armour rds may appear simple but they are strategically designed to be exceptionally effective at calf muscle containment when training and competing. Repeated muscle vibration is directly related to causing fatigue, muscle damage (small tears) and shin splints, which these g Under Armour rds will prevent. The convenience of the calf g Under Armour rds allow the athlete to use their preferred sock and can also be worn under a wetsuit making transition times faster during a triathlon.