Using the Lazer Tempo KinetiCore Unisize Helmet is easy. First, put the helmet on your head and use the TurnSys system to adjust it vertically until it fits securely. You can attach the Winter Kit if it's cold outside and the Universal Lazer LED at the back for better visibility. When riding, make sure the helmet sits evenly on your head. For maintenance, clean it regularly with a mild soap and water. Don't use harsh chemicals as they may damage the helmet. Check the helmet for any signs of wear and tear after each ride, and replace it if there are any cracks or significant damage. Store it in a cool, dry place when not in use.