The EXO Calf Long Sleeves are an EXO technology calf supports that improve performance and recovery by supporting muscles and increasing blood flow. Better alignment of your body to run easier uphill, downhill and on uneven trails. Exo Sensifit Stability reduces cramping and muscle soreness by saving energy. Furthermore it prevents injuries. AdvancedSkin ActiveDry technical fabrics improve body comfort by keeping you dry, warm and protected when you need it and where you need it. Also features a ClimaUV 50+ that protects your skin from the sun's harmful UVA and UVB rays. The measures are: Long (greater than 42cm) - 1 (29-31cm), 2 (32-34cm), 3 (35-36cm), 4 (37-38cm), 5 (39-41cm), 6 (42-44cm). Material: Polyamide, Elastane, Polyurethane.