The OXO Tot Sippy Cup is a spill proof solution for teaching baby how to drink like a big kid. The 15 ounce Sippy Cup has a non slip grip, a dimple in the lid that makes room for little noses and translucent walls to show just how much is left. A leakproof valve releases pressure for comfortable sipping and is easily removable for cleaning. Valve is shaped for easy assembly and cleaning. All OXO TOT Sippy, Straw and Training Cup lids are interchangeable. Top rack dishwasher safe.