Thin, tapered spout for little mouths. Break-proof. Fun designs. Educational designs for infants and toddlers to help identify objects and develop visual perception. Sipster cup uses the patented Playtex Sip-Ease Valve: Eliminates messy spills. Easy to activate - liquid flows easily when child sips. Easy to clean. Playtex Cup Lid: Interchangeable with all Playtex cups. With valve storage feature - no losing valve in the dishwasher! Valve stores under lid for dishwashing. Replacement SipEase valves are sold separately. Made in USA.