This portable vacuum insulated cap is made of food-grade stainless steel on both inside and outside walls. Double-Wall vacuum insulation keeps drinks hot or cold for a long time, and the cup's surface will be always in a comfortable temperature whether it is hot or cold drink inside. The light and compact design is great for effortless transport and storage. Movable silicone strap gives you a different experience. You can enjoy various drinks everyday. It is perfect for camping, travelling or taking it to your office. Custom logo is available.