Made of High-quality food grade 304 stainless steel. Eco-friendly, shockproof and shatter proof, rust and leak proof, scratching resistance, double wall, no sweat, no condensation on your desk any more. You can use it in all type of occasion like sports, go to work, go to beach, school, office, picnic, hiking, camping, road trips, eat lunch out, on the road for soup, traveling, trip, driving, mountaineering, backpacking, hot yoga, gym, fitness. For popular needs, we design in lightweight, sleek, tough, fits most car cup holders, bottle cages and your bag. 12oz, 25oz, 34oz are available.