No matter what recreational activity your child is engaged in, the No-Spill Sport Sipper by Nuby is perfect for parents and children on the go! Nuby developed the Sport Sipper with an innovative, ergonomic shape and easy grips that ensure a comfortable and secure grasp. Also included is a unique, soft silicone straw with a built-in valve; it opens with sucking action and closes when not in use. The Nuby BPA-Free Sports Sipper - 2 Pack - 10 oz. - Girls features:Soft silicone straw features a built-in valve, eliminating extra pieces to wash Valve opens with sucking action and closes when not being usedAdjustable for slow, medium and fast flow ratesNo-spill design prevents spills and reduces leaksEasy-grip design makes it easier to holdBPA freeTop-rack dishwasher safeIncludes 2 sport sippers with protective plastic coversSize: 10 oz