The sturdy clear lid keeps an air-tight close on your cup, reducing the risk of spillage, and the lid’s transparency will show you just how much is left in your tumbler. These RTIC 20 oz Tumbler is made from durable stainless steel to give you a firm, comfortable grip on your cup to keep you from spilling! RTIC Tumblers alps include a double vacuum wall insulators to keep your beverage fresh. It keeps drinks hot for hours and keeps ice from melting. You’ll never have to worry about your coffee getting cold again!