Repeated muscle vibration can be directly attributed to muscle fatigue, damage (small tears) and shin splints, which this item ultimately prevents. The convenience of the guard allows the athlete to use their preferred sock and can also be worn under a wetsuit making transition times faster during a triathlon. Key difference: Compression Guards- A light weight muscle containment piece great for all activities with extreme moisture management and UPF50+ sun protection. Compression Sleeves- With a thicker fabric than the guard, 2XU sleeves offer powerful graduated compression great for all-purpose activities and recovery.