Glass Double-Wall Tumbler by Sun&rsquo;s Tea (TM) | 18oz Travel Mug with Lid | Ultra Clear (See-Thru) Borosilicate Glass ERGONOMIC: Offers an easy, grip & flip design and size (18 oz) ideal for one handed use (with or w/o straw) perfect for every day use - on-the-run, on-the-road, or in-the-air travel DURABLE: Handcrafted with premium, double walled (borosilicate) glass, delivering a long-lasting, high quality glass drinkware solution VERSATILE: Tumbler is heat resistant and cool to touch (no sleeve required) featuring 2 layers of insulation, keeping your drinks hot or colder for longer periods without condensation SAFE: Microwave and Dishwasher safe travel mug with 100% BPA free screw-on wide mouth lid  bottle does not contain plastic or metal taste and aroma GUARANTEED: Includes 6 month warranty ensuring your satisfaction and positive feedback