Eco 11-Ounce Ceramic Double Wall Thermal Coffee Tumbler w/ Silicone Lid - Black Turn your everyday disposable cup into an eco-friendly, reusable mug. Double-walled porcelain construction insulates hot and cold beverages. Flexible silicone sippy lid seals tightly to prevent splashes and spills. Safe to clean in the dishwasher and to warm in the microwave. Great gift idea, minimizes the waste of coffeehouse paper cups.