To use this Giro Source MIPS mountain bike helmet, first adjust the Roc Loc 5 system to get a secure and comfortable fit on your head. Then, set the adjustable moto - style visor according to your needs, like blocking the sun or rain. During your ride, the helmet's 17 vents and internal channels will keep you cool. When you're done riding, store it in a cool, dry place. To clean it, use a mild soap and water. Don't use harsh chemicals as they may damage the polycarbonate shell or the MIPS system. Regularly check the helmet for any signs of damage, and if you notice cracks or significant wear, it's time to replace it for your safety.