Nuby's Thirsty Kids Sip-It Sport cup is great for travel and on-the-go sipping. Nuby has designed the Sip-It Sport cup with a soft silicone spout that is gentle on children's teeth and gums. The spout features our pressure-sensitive TOUCH-FLO valve to help prevent drips and spills. The TOUCH-FLO valve regulates fluid intake as children drink from the spout, opening only with the pressure from their mouth. When not sipping from the spout, the valve closes, ensuring a leak-resistant cup. The Thirsty Kids Sip-It Sport cup features a base that is contoured especially for little hands and a hygienic cover that helps protect the spout while not in use.