This 500 ml double-wall stainless steel bottle combines style and functionality, featuring a 304 stainless steel inner wall and 201 stainless steel outer wall with a matte black finish. Vacuum insulated to keep beverages hot or cold, it comes with a screw-on 201 stainless steel lid topped with bamboo for a modern, eco-friendly touch, making it perfect for everyday hydration at home, work, or on the go.