Made of Stainless steel & PP Anti-leak closure design Retains temperature for 6-8 hours Small mouth for easy sipping MATERIAL: Made of BPA Free Lid and High Quality 304 Food Grade stainless steel. Easy-to-clean nonstick interior. PERFECT SIZE FOR CARRY: 17 ounce capacity is perfect size for girls,women, kids. The size of cup is suitable for handle.Convenient to carry, and there are big capacity to drinking. Hand wash only - do not put in dishwasher. SMART BUTTON: The push-button lid is very interesting, first ring button down, and then press the button to open.The ring button is designed to reinforce the seal so that the opening is not easily opened.