DescriptionThis productmade of ABS materials. Suitable for full-time outdoor workers in low-risk workplaces, compatible with baseball caps and provides head safeguard.It can perfectly keep the shape of your helmet and provide you with a longer service life.Features- Color: Black - Material:ABS - Size: About 19.50X15.00X9.50cm/7.66X5.89X3.73in -Owning the strong wear and break resistance ability, verypractical, with excellent texture.- Crash-proof inserts fit inner most caps and are suitable for outdoor workers in low-risk environments.- The practical caps Liner keeps the caps in perfect shape and supports it for longtime.- With ventilation holes to increase permeability, lightweight and breathable without losing toughness.- Specially designed to fit the shape, more comfortable and reasonable with the helmet.