PREMIUM MATERIALS - Our insulation tumbler are made of food-grade 304 stainless steel and comes with a push-on lid keep any dust particles getting in and stop major spills, durable and double-walled vacuum insulation, which can keep your tumbler cold and hot for hours.
DOUBLE-WALL INSULATION - Our skinny travel tumblers are double walled and vacuum insulated, which keeps your drinks hot up to 4 hours or cold up to 9 hours.