Another Spooky season is upon us! Lets Celebrate Mickey's Boo to You Halloween Parade! This special 20 oz tumbler comes with a lid. Glows green in the dark. must be "charged" by placing it in lighted areas for a few hours before glow. Or you can choose the Haunted Mansion design, which glows purple! Again it must be placed in direct light to “charge” the glow.