304 Stainless Steel Promises robustness and rust resistance for lasting performance Leak Proof BPA Free Advanced design ensures leakproof and spillfree performance while also being BPAfree Double Wall Vacuum Insulated Keeps drinks or cold for up to 24 hours Portable and Convenient Design Ergonomically crafted for easy carrying ideal for gym travel and school Trendy Stylish Design Features a modern and chic design that adds a touch of glamour to your daily hydration routine