Specifications:Dual-wall construction: Insulating layer of air keeps heat out and cold inInner foil liner reflects solar rays for added thermal protectionConstructed of low density polyethylene (LDPE #4): a durable, lightweight, and FDA food-grade approved materialBPA- and phthalate-free

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Polar Bottle Insulated Water Bottle, Andromeda, 24-Ounce by Polar BottlePolar Bottle