The Spandex has superior compression characteristics for maintaining firm pressure on the calves. The Polyester allows air to circulate to the skin, while at the same time allowing moisture to wick out. Calf compression sleeves have graduated compression that reduces muscle vibration, which in turn reduces muscle fatigue and soreness. Also it can be used as a recovery sleeve, Enhance blood circulation helps oxygen starved muscles recover much faster than normal. Suitable for All Sports: These shin splint compression sleeves aid in mitigating shin splints, preventing calf cramps, protects legs from minor scratches and knocks. A must have for sports activities that involve a great amount of stress on the calf like: Marathon, Walking, Jogging, Running, Hiking, Gym Fitness Training, Basketball, Cycling, Weightlifting and more. Main Function: Decreasing pressure protection perspiration breathable Enhance muscle endurance Prevent calf thickening Auxiliary Muscle Force Boosts circulation and helps you recover faster Protects from minor or rock scratches, knocks Specification: Material: Spandex and Polyester Season: All Gender: Unisex Optional Color: Black,Blue,Green,Red,White Optional Size: app. M / L / XL Size:M(US6/UK10/EU36)Perimeter 1: 26cm-32cm(10.23in-12.59in)Perimeter 2: 16cm-19cm(6.29in-7.48in)Length: 29cm(11.41in)Weight: 65kg Size:L(US8/UK12/EU38)Perimeter 1: 28cm-34cm(11.02in-13.38in)Perimeter 2: 18cm-21cm(7.08in-8.26in)Length: 30cm(11.81in)Weight: 75kg Size:XL(US10/UK14/EU40)Perimeter 1: 30cm-39cm(11.81in-15.35in)Perimeter 2: 20cm-23cm(7.87in-9.05in)Length: 31cm(12.2in)Weight: 100kg Quantity: 1 pc Note: Transition: 1cm=10mm=0.39inch No retail package. Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 x Compression Calf Sleeves(other accessories demo in the picture is not included.)