With double-layer vacuum insulation technology, this stainless steel drink cup can keep cold for 9 hours and heat for 3 hours, allowing you to have a hot drink on a cold morning or a cold drink after exercise. The simple design is sleek, minimal and versatile. All classic glasses are shaped to fit a normal sized cup holder. The glasses and straws are made of 18/8 food grade stainless steel for durability, the interior is electropolished to ensure your cups stay rust-free, and the exterior colored powder coating makes it super easy to grip. Comes with a reusable stainless steel straw and splash-proof lid to help you keep things tidy. Wide mouth allows for quick cleaning and quick filling.