Our ergonomic smooth and gradual taper is subtle yet very practical. Tight fitting lid with a spill resistant slide. Product Features: Double wall stainless tumbler Material: Double-wall18/8 stainless steel Vacuum insulation Durable,rust-proof Sweat-free design BPA-FREE, including the shatter-proof and dishwasher safe Keeps cold for 24+ hours Keeps hot for 6+ hours