1.Material: nylon， spandex， latex;<br />2.professional sports geer;<br />3.high-quality environmental materials;<br />4.The ergonomic design， simple fashion;<br />S: 30-40cm(11.7-15.7")<br />M: 35-45cm (13.8-17.7")<br />L: 40-50cm (15.7-19.7")<br />XL: 45-55cm (17.7-21.7")<br />XXL: 50-60cm (19.7-23.7")