Made of a strong, EU food grade plastic (polypropylene with glass reinforcement), this mug is microwave and dishwasher safe and easy to wash. Passage series products are great for hikers, bike tourers, campers and why not for use at your summer cabin. While this is not a full-tilt thermos mug, its doublewall structure will keep your drinks warm for longer than regular ones. The measuring scale on the inside is a highly practical feature for an outdoor or camp cook - you're always carrying a measuring cup when you've got your Passage cup with you. - Lifetime guarantee against defects in materials and manufacture - BPA-free, PFOA-free, PTFE-free