describe:Beer in a can, long neck or glass? what do you like the most? any You can choose how you prefer: whether to crack the can, let the longneck chill for 4 hours, or pour the beer straight into the 473ml glass. With built-in can and bottle opener To complete your experience, it has a can and bottle opener built into the lid. Developed with 2-layer vacuum insulation with a vacuum between the two layers, beverages can be kept cold for at least 4 hours without heating up. With this premium quality product, your drinks will stay cold for up to 4 hours, even if your beer doesn't need that long. If you prefer to serve it with hot beverages, no problem It also maintains temperature for up to 2 hours. This is a 100% BPA free product made with high quality materials that will increase the durability of the mug for years to come Bring more health to you and less pollution to the earth.