Your customers will love to get the skinny on these slim insulated drinking tumblers. Made of powder-coated double wall insulated stainless steel, this vessel maintains the temperature of 20 ounces of your favorite hot or cold drinks. The UV color change coating reveals a surprise — expose them to sunlight and watch the color change before your eyes! Once out of the sun, they return to their normal colors. Available in assorted color changing shades — add your school, sports team, organizational or company logo or message to customize.