The Nuby Easy Grip Spill-Proof Cup with Soft Flex Straw is ideal for staying hydrated on the go. This cup features a soft silicone straw that's gentle on children's teeth and gums. The soft straw is equipped with our pressure-sensitive TOUCH-FLO valve, which helps prevent drips and spills, opening only when pressure is applied to the mouth. Each cup holds up to 300 ml of liquid.