Zak Designs 2183-R101-AMZ HydraTrak Tumblers, 20oz w/Straw, Seafoam-Rainbow 20 Staying hydrated is an important part of being healthy; Zak! Designs' innovative HydraTrak Tumbler helps keep track of how much water you are drinking Monitor your water intake with included rainbow bands; wear the rainbow bands as bracelets, or roll them up the tumbler Remove straw and use the built-in silicone stopper to plug the hole for a spill-proof lid; easy to remove lid has silicone gasket for secure closure Insulated double wall construction keeps drinks colder longer and reduces condensation; use at home, at the gym or on the go; fits in most cup holders Holds 20 oz. and is made of Tritan plastic that is durable and BPA-free; top rack dishwasher safe, do not microwave