Specifically designed for runners and triathletes, these compression sleeves provide proven relief for shin splints, calf strains, and other running ailments. The chevron ribbing that provides the compression is in the same taping schematic that is used by athletic trainers to help prevent and relieve shin splints. Targeted support for both the calf and the shin promote increased circulation and optimized conditions for healing. Anti-microbial, thermal regulating, moisture wicking fabric resists odor and allows skin to breathe. Xsmall/Small fits calf size 9.5" - 12" Small/Medium fits height 5"10" and below, calf size 12.5"- 15" Large/Xlarge fits height 5"11" and up, calf size 15" and up