The Nuby No-Spill Insulated Cool Sipper keeps liquid fresh and cool and helps protect furniture from a "sweating" cup. You and your child will be delighted with the transition to cup drinking thanks to Nuby's valveless, leak resistant design. The soft silicone No-Spill spout is uniquely designed to prevent drips and spills while being delicate and gentle to your child's gums and new teeth. The pressure sensitive TOUCH-FLO feature regulates fluid intake with the sucking action of child- when sucking action ceases, the spout closes, ensuring a leak resistant cup.