To use this helmet, first adjust the fit system to fit your head size between 54 - 58 cm. Then, fasten the adjustable straps under your chin firmly but not too tight. When you're riding, the aerodynamic cooling vents will keep you cool. As for maintenance, use a mild soap and water to clean the exterior and interior of the helmet. Don't use harsh chemicals as they might damage the materials. After cleaning, let it dry naturally. Always check the helmet for any cracks or damages before each use. If you find any, replace the helmet immediately to ensure your safety.