Using this Hydro Flask cooler cup is a breeze. If you want to use it as a can or bottle cooler, simply place the can or bottle into the cup with the flexible collar on top. The TPU sleeve will hold it in place. To use it as a beverage cup, put the flexible collar at the bottom of the cup. Make sure to keep the cup clean. You can wash it with mild dish soap and warm water. Avoid using abrasive cleaners as they might scratch the stainless - steel surface. Don't put it in the microwave or dishwasher, as this could damage the insulation and the material. With proper care, this cup will serve you well for a long time.