Spills and leaks are a thing of the past. With Nuby’s Clik-It Flex Straw cup, parents don’t have to worry anymore about accidents and the stains that come with them. No leaks, no mess. The silicone straw features a pressure-sensitive Touch-Flo valve that helps prevent leaks. Hear the sweet sound of security. The Clik-It top clicks into place, ensuring it's closed tight. Designed to help your kiddo get a grip. The contoured cup base is easy for little hands to hold. Nuby always keeps your family’s safety in mind. The Clik-It Flex Straw cup is made of safe and durable materials. Stay happily hydrated. The Clik-It Flex Straw cup holds 10 oz/300 ml of liquid to keep little ones steadily sipping.