NAYAD® Traveler 40 oz Stainless Double-wall Bottle with Twist-Top Spout is made of 18/304 rust-free stainless steel construction, double-wall insulated. Copper-lined to keep beverage hot for up to 10 hours and cold for up to 20 hours. Has a wide-mouth lide that is 100% BPA-free Triatan™ plastic with twist-top spout and a zinc alloy metal handle that is strong and durable making it easy to carry. Hand wash only. FDA certified.