This double-walled, vacuum-sealed tumbler is made from 18/8 Stainless Steel to be condensation free and has a Non-Slip Silicone Base. The BPA-free lid features push-seal and open/close toggle and a reusable, polypropylene straw. It's cup holder friendly and will keep your drinks cold up to 24 hours and hot up to 12 hours. All 22oz Tumblers and accessories (lids, bases and straws) are top-rack dishwasher safe.