Details Our bottles feature triple-walled construction, designed to keep beverages cold for up to 24 hours or hot for up to 12.. Constructed of high-grade 18/8 stainless steel. BPA-free.. Condensation-free, the exterior will remain dry.. 17oz emulates a standard size water bottle, and is perfect for staying hydrated at the gym or on-the-go.. Authentic S'well products direct from the manufacturer are only shipped and sold from Amazon.com..