To use this Hydro Flask cooler cup, simply place your 12 oz slim can or pour your favorite beverage into it. The flexible collar can be adjusted according to your needs. If you're using a can, put the collar around it for a snug fit to lock in the cold. For loose beverages, use the collar as a stabilizing base. When cleaning, you can safely put it in the dishwasher. Store it in a dry place. Avoid dropping or hitting it hard as it might damage the vacuum insulation. This cup is designed for long - term use, so with proper care, it will serve you well for years.