Made of durable material to support your hat, the baseball caps liner is practical and creative to use and will not easily deform. The hat support can perfectly keep the shape of your hat and provide you with a . And this hat liner can also be used to safeguard your head, suitable for outdoor sports. Features - Color: Black -Material:ABS - Size: 19.00X17.00X11.00cm/7.47X6.68X4.32in -It is made of safe and durable material, which can provide you with excellent durability and breathability, easy storage and practical for daily use, with compact and design. -Our Crash-proof have internal reinforcements that are stronger and provide better protection. It's great for work environments that don't require a formal . -This hat liner can be a great gift for your friends or family members to prevent them from getting hurt. -Perfectly detailed with a unique vent design for better breathability. Keep your head dry while riding or cycling. -Suitable for maintenance, auto assembly, machining, rail transportation, workshop processing, outdoor sports and other industries. Package list: 3 x cap