Premium 18/8 stainless steel construction ensures durability and corrosion resistance for long-term use. Double-wall vacuum insulation maintains beverage temperature for 12 hours hot or 24 hours cold. Built-in fine-mesh tea filter allows convenient loose-leaf brewing while preventing residue leakage. Ergonomic press-on lid with silicone seal prevents spills during travel. Mirror-polished exterior with brushed finish resists fingerprints and scratches. Ideal for office commuters, outdoor adventures, and daily hydration routines. Commercial-grade materials meet FDA standards for food safety. Leakproof design fits most vehicle cup holders and backpack pockets. Optimized 450ml capacity balances portability with sufficient volume. Precision-welded seams and ultrasonic cleaning process ensure hygienic performance.