This Tumbler with the Straw bottle has a double-layer structure, no matter whether the water is hot or cold, it can ensure a comfortable temperature on the outer wall of the bottle. This tumbler is made up of nontoxic material. stardust tumbler travel mug designed with straw. The wide screw cap has a fancy design that has excellent sealing performance and is not easy to leak, for any athletics, such as gym, running, dancing, cycling, or exercise.It holds 15 ounces and is made of durable, long-lasting materials.