Sturdy 304 stainless steel construction ensures long lasting rust resistance, while the double walled insulation maintains ideal temperatures for hot or cold beverages Designed for active lifestyles perfect for gym enthusiasts needing hydrations during workouts and outdoor adventurers requiring efficient drinkware on hiking trail Maintains beverage temperature during extended hours, camping trips, or intense physical activities with its vacuum sealed thermal insulation technology Features a spacious, wide mouths design for easy filling and cleaning, complemented by a smooth interior that prevents residues buildup and odors This stainless steel tumblers combines durability with ergonomic functionality, offering a 24 hour temperature retention systems and dishwasher safe convenience for modern households