Our Star Shimmer Tumbler is made of Plastic that is known for strength and clarity. Other Plastics become foggy and dull over time. Our Plastic will remain clear and vibrant. This Tumbler will not break, crack, or chip. Coordinating Lid included and has a secure snap fit. Double Wall insulation will help keep your cold drinks, colder and hot drinks, hotter. Tumbler is dishwasher and microwave safe. Tumbler can go straight from the freezer to the microwave.