This product is made of materials. Suitable for full-time outdoor workers in low-risk workplaces, it is compatible with baseball caps and provides head safeguard. It will be practical and creative to use, supports the caps and is not easily deformed. It can perfectly keep the shape of your and provide you with a . This bump caps liner can safeguard your head from head injury. Features -Color:White -Material:PE -Size:21.00X17.50X9.50cm/8.25X6.88X3.73in -The hat liner is made of PE material, which will be , sturdy and practical for your use. -These hat accessories are creative and highlight your personal style to wear this comfortable baseball caps during all outdoor activities. -Reduce stress on your head and neck muscles when working in a workplace that does not require the protection of a full hard hat. -Simple and elegant design. A good choice especially for everyday use and outdoor activities. Good strength and reliability make the baseball bumper caps good resistance. -The Practical Caps Liner keeps the caps in perfect shape and supports it for a long time. Strong and materials are chosen for long life. Package list: 4 Liners