Beer koozies and can coolers come in various materials. The most common material on this list is stainless steel. These models often feature double wall vacuum insulation and offer the longest cooling time, often up to eight, ten, or twelve hours. The next most common material is neoprene, well known for its use in wetsuits. This material offers exceptional insulating properties and compacts for easy storage. These often come in a variety of sizes to fit cans, beer bottles, slim cans, and more. They keep your drinks cold for about 30 to 60 minutes depending on the ambient temperature and the starting temperature of your drink. Lastly, you will also find foam koozies, which offer the least insulation but are often the lightest and most customizable.