Premium 18/8 stainless steel inner wall with double-wall vacuum insulation for 24-hour temperature retention. High-grade borosilicate glass exterior resists thermal shock and maintains drink purity. Precision laser-welded seams ensure complete leakproof performance. Ergonomic silicone base prevents slips and compatible with car cup holders. Ideal for office commutes, outdoor adventures, and home use. Commercial-grade durability withstands daily industrial dishwashing. Mirror-polished spout offers smooth pouring without dribbles. BPA-free materials meet FDA standards for food safety. Ultra-lightweight design (380g) with 500ml optimal capacity. Lifetime warranty against manufacturing defects.