We over engineered these double wall insulated tumblers with an 18/8 stainless steel body, which means your drink still keeps its temperature no matter how much of a beating this cup takes. These YETI Ramblers come standard with our YETI MagSlider Lid, the only drink lid that uses the power of magnets to keep your water, beer, or favorite drink on lock. Double-wall vacuum insulation keeps drinks cold to the last drop No sweat design prevents condensation, keeping hands dry Dishwasher safe because no one needs more work to do 18/8 stainless steel resists dents and drops