Zak Designs HydraTrak 20 oz. Double Wall Tumbler with Lever Lid, Ghost 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 One hand operation; push the lever down to drink, release lever to close; 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