Under Fits Helmet: It can be used on its own or under your helmet.It can solve problems such as uncomfortable wearing of the helmet, feeling sticky and dirty, and the helmet lining easily getting dirty. Air Holes Design: Strategically placed mesh holes enhance airflow to prevent fogging and suffocation during intense workouts. With high elasticity, it is suitable for most people of different head circumferences.Not only keeps you cool and dry, avoids feeling sticky in summer, but also keeps warm in winter.Symmetrical Weave: Proprietary nylon-spandex blend fabric features identical texture on both sides, ensuring no inside-out confusion while maintaining 360.° sleek style. Product Details: Material: Nylon, Spandex Size: One Size Fits Most Gender: Unisex; Male, Female Color: 7 Colors. Season: Spring, Summer, Fall, Winter Package Included: 1PCS * Face Mask Balaclava