Description This adjustable helmet strap is designed for cycling and mountain biking helmets, featuring a knob for easy head circumference adjustment. The strap ensures a secure fit, enhancing safety and comfort during rides. Its wear-resistant material keeps durability, making it an essential accessory for any cyclist. Features -Color:Black -Material:Plastic -Size:30.00X3.50X2.00cm/11.79X1.38X0.79in -Quick adjustment system: equipped with a convenient knob, allowing easy adjustments to the head circumference, ensuring a secure and comfortable fit for various head sizes during cycling -Enhanced protection design: made with high strength materials, significantly improving the helmet's impact resistance, providing comprehensive safety for mountain biking activities -Lightweight structure: crafted from lightweight materials, reducing the burden on the head, ensuring no pressure even during long periods of wear, for an enjoyable riding experience -Ventilation and heat dissipation: featuring a multi hole design that promotes air circulation, keeping the head dry, ideal for hot weather or high intensity cycling activities -Convenient chin strap: adjustable chin strap design ensures the helmet fits securely, reducing movement during activities, enhancing cycling safetyPackage list: 2pcs Chin Strap