Versatile and dependable. Non-toxic, BPA free, lightweight, rust-resistant, and premium grade 18/8 stainless steel. Say goodbye to paper cups and costly waste. Double-wall vacuum insulation keeps drinks cold as low as 46°F up to 27 hours and hot as high as 140°F up to 5 hours. Convenient swing lock and lid with silicone gaskets prevent spills and maintains ideal temperature. Sip on the Metro Mug near the warm campfire. Bring your Metro Mug to the library study session. Use with or without a straw. Attached handle provides firm grip. Non-slip silicone bottom reduces noise and easily grips onto flat surfaces. Durable and beautiful exterior powder coating resists against scratches, cracks, and peelings.