Description This product is made of durable materials. Suitable for full-time outdoor workers in low-risk workplaces, it is compatible with baseball caps and provides head safeguard.It can perfectly keep the shape of your helmet and provide you with a long service life. This bump caps liner can safeguard your head from head injury. Features -Color:Black-Material:ABS, Plastic-Size:20.00X18.00X10.00cm/7.86X7.07X3.93in- Made from good protection for our heads against bumps, scratches and so on.- Practical safety bump cap insert can be widely applied for rail transit, workshop processing, outdoor sports and other industries.- There are air vents to increase the permeability, light and breathable without losing tenacity.- Specially designed to fit the shape, more comfortable and reasonable with the helmet.- This hat liner can be a considerate gift for your friends or family members to prevent them from getting hurt.Packing list: 1 x Caps Liner