This tumbler is made of food-grade 304 stainless steel inside and out, with a lid and straw of food-safe materials. It offers durable powder coatings, colorful paint finishes, and quality textures. Features double-wall vacuum insulation that keeps drinks warm or chilled for 6–12 hours, a 2-in-1 lid for direct sipping or straw use, an easy-lift ergonomic handle for secure carrying, and a reliable leak-proof design to prevent spills.