Using this Hydro Flask 12 oz. Slim Cooler Cup is easy. First, you can either place a slim can or pour 12 ounces of your favorite beverage into the cup. Then, if you want to stabilize your drink, put the flexible collar at the bottom of the cup. It's great for use in cars as it fits most cupholders. When it comes to maintenance, you're in luck because it's dishwasher safe. Just toss it in with your regular dishes for a quick clean. Remember, since it's made with 18/8 pro - grade stainless steel and has a Color Last™ powder coat, it'll last you a long time. Also, it's BPA - Free and Toxin - Free, so you don't have to worry about any harmful substances leaching into your drink. Keep enjoying your hot or cold beverages with this amazing cup for hours on end thanks to the TempShield® insulation.