Targeting the calf muscle, 2XU Calf Sleeves with PWX POWER fabric are a great muscle containment device that can be worn during training or competition but are designed especially for recovery. Supporting the calf muscle reduces muscle vibration allowing the calf muscle to operate more efficiently reducing fatigue and muscle cramping, increasing power and strength, and mitigating shin splint issues. The 2XU Calf Sleeves will protect your calves from fatigue, muscle soreness, and cramping while helping you recover faster. Sold in pairs.