Using your Cinettica Velocita helmet is easy. First, adjust the dial retention system to fit your head size comfortably. Make sure it's snug but not too tight. The short visor can be used to block the sun from your eyes. When riding, especially in hot weather, the 23 ventilation ports will keep you cool. For sizing, if your head circumference is between 54 - 58cm, choose the S/M size. If it's between 58 - 62cm, go for the L/XL size. As for maintenance, use a mild soap and water to clean the helmet. Avoid using harsh chemicals as they might damage the helmet. Check the helmet regularly for any signs of damage, and replace it if it's been in a crash or shows significant wear and tear. Always ensure the helmet meets the current AS/NZ safety standards for your own safety.