With the Twist 'n Click® Cup feature, simple twist lid on the Insulator® cup until you hear and feel the lid click close, then you'll know the cup is 100% leak-proof. Designed for baby. Thin, tapered spout ideal for little mouths. Insulated to keep drinks cool and fresh longer. Easy to activate--liquid flows easily when child sips. Designed for mom. Durable cup is 100% break-proof. Lid is interchangeable with all Playtex® cups. All parts are dishwasher safe. Patented spill-proof valve eliminates messes and easy to clean. Keeps Drinks Cool Longer 100% Spill-Proof, Leak-Proof, Break-Proof, Guarantee* BPA Free Twist 'n Click Leak-Proof Seal