Sizing: To determine your size, measure the circumference of the fullest part of your calf. The use of compression sleeves in a running workout has its many adavantages. Reap the benefits of increased blood circulation and muscle oxygenation with the women's Allsport Compression Sleeve wrapped around your calf! ; Features a compression sleeve used by professional athletes and triathletes alike. Great for: Pre-Exercise - Activates muscles while reducing the risk of injury. During Exercise - Optimizes performance and stabilization while reducing muscle strain. Post-Exercise - Quicker and shorter recovery phase. Used by professional triathletes around the world. CellTex Fiber finishing facilitates the biological activation of skin cells and provides a comfortable, skin sympathetic and climate-regulating wear. Protects the shin against shin splints and impact stress. iPS (Integrated Power System) - A defined compression with scientifically patented pressure profile improves blood circulation and enhances performance. Consists of 79% polyamide, 21% spandex. Wash in cold water. Tumble dry in low heat. Sold as a pair.