Product Features: Liner Material: Made with high-quality 304 stainless steel for the interior, ensuring excellent resistance to rust and corrosion and preserving the natural taste of your beverages. Insulation: Double-wall vacuum insulation design keeps drinks hot for up to 12 hours and cold for up to 6 hours — perfect for daily use, outdoor trips or gym sessions. Body Material (Interior & Exterior): Both the inside and outside of the flask are crafted from durable 304 stainless steel, combining a sleek modern look with robust everyday durability. Shell Material: The outer shell is also constructed from 304 stainless steel, offering a smooth hygienic surface that’s easy to clean and built to last. Capacity: With a generous 25 oz (750 ml) volume, the flask provides ample space for water, coffee, tea or smoothies — offering the ideal balance of portability and capacity. What is in the box? 1 HydroRig Bottle with Magnetic Lid 1 Adhesive Metal Ring (compatible with non-MagSafe phones) 1 Care & Instruction Manual