Using this Giro Fixture MIPS II Bike Helmet is easy. First, adjust the Roc Loc® Sport fit system to ensure it fits your head comfortably. The Universal XL sizing (58 - 65cm) makes it suitable for a wide range of head sizes. When riding, make sure the helmet is firmly on your head. For cleaning, use a mild soap and water to gently wash the quick - dry padding. Avoid using harsh chemicals as they may damage the helmet. Store the helmet in a cool, dry place away from direct sunlight. Also, regularly check the reflective rear decals for visibility and the Mips® system for any signs of wear. If you notice any damage, it's best to replace the helmet for your safety.