ZENSAH Compression Leg Sleeves provide dual action support and compression to the calf and shin area for improved athletic performance and recovery. Compression improves oxygen blood flow allowing athletes to train harder and recover faster. The chevron ribbing at front reduces the risk of shin splints and pin-point compression at the back provides calf support. Zensah uses a special seamless knitting process for a fabric that is soft, breathlable and wicks moisture. An anti-microbial treatment keeps odors at bay. The sleeves can be worn during training and racing to help support muscles and increase oxygen blood flow to the muscles of the lower leg. Leg Sleeves are also valuable recovery aids since the more oxygen the muscles receive, the faster they recovery allowing athletes to push the envelope in their training. The Zensah Calf/Shin sleeve is ideal for runners, cyclists and triathletes. Ships in pairs. Sizing: Small/Medium - Fits 5"9" and Shorter or 11.5" - 14.5" Calf curcumference; Large/XLarge - Fits 5"10" and Taller or 14.5"+ Calf circumference.