Any tumbler that's coming along for the ride needs to be tough enough to keep up. Our RamblerA(R) 20 oz. is made from stainless steel with double-wall vacuum insulation to protect your hot or cold beverage at all costs. No freezing mornings or sweltering days will compromise your drink. Comes with the MagSlider(TM) lid and is available in stainless and DuraCoat(TM) colors.Kitchen-grade, 18/8 stainless steel makes this tumbler resistant to dents and dings. Our No Sweat(TM) Design keeps hands dry and protected from hot coffee. And best of all, it's dishwasher safe, because no one needs more work.18/8 STAINLESS STEELMade with kitchen-grade stainless steel, so they're puncture- and rust-resistant.DOUBLE-WALL VACUUM INSULATIONKeeps cold drinks cold and hot drinks hot until the last sip.DISHWASHER SAFEBecause no one needs more work to do.