100% Rust-Proof Stainless Steel: Made with high-grade 304 stainless steel inside and outside for lasting durability and hygiene. Double Walled with Copper Coating: Vacuum insulated construction ensures long-lasting temperature retention – keeps drinks hot or cold for up to 24 hours. Sleek & Stylish Design: Premium spray-painted blue finish with a modern look, perfect for gym, office, school or travel. Leak-Proof Threaded Cap: Secure thread-type cap prevents spills, making it ideal for everyday use. Warranty: This product comes with 1 year warranty by Borosil for any manufacturing defect.