1.Material PC EPS, integrally shaped process, the shell/outer skin and EPS are not easy to fall off. The of the skier is guaranteed.2.Adjustable size M 21.65'22.84' (5558cm), L 22.84'24.02' (5861cm), XL 24.02'24.8'(6163cm). Weight only 0.81 lb, lightweight and very comfortable. It fits most people. A uniform regulator upgrade to high toughness materials to improve comfort and increase the factor.3.Sweatattracting chin pad it is with a chin pad. The sweat is quickly absorbed. It increases comfort to prevent accidental injuries. Removable Earmuff the removable ear cotton is convenient for ers to clean. Adjustable to fit your head size; Yshaped adjustable chin strap for optimal fit.4.Breathable and lightweight ventilation system with air outlet slots ensures comfortable, breathable and dry. And the light weight is easy for you to turn around your head. helmet makes it easier for you to move around.