Polyurethane blended nylon material is smooth, stretchy, and feels gentle on the skin. Comes with a UV cut function that can also be used as a countermeasure against the sun, and a sweat-absorbing quick-drying function that makes you happy even when you sweat. The pleats allow you to adjust the fit. The ear hooks are made of the same fabric, so it is also recommended that your ears will not hurt.