Kids are animated and active, even while holding (and occasionally dropping) their drinks. The Nuby Active Sipper Insulated Cup is here to help parents stop worrying about spills and leaks! The bite-resistant hard spout has a Vari-Flo valve that helps prevent drips and spills by regulating fluid intake as children drink. When sipping stops, the valve closes for a leak-resistant cup. The cup base is insulated, keeping liquids cool while also protecting furniture from condensation. The ergonomic shape ensures a comfortable, secure grasp for small hands, and the included carabiner attachment makes it easy to attach the cup to bags or backpacks. Whether your little one is at home, in the car, or on the go, they can stay happy and hydrated without ever leaving behind their favorite cup! 18+ months Holds 9 fluid ounces (266 ml) of water, juice, or milk each Leak-free and mess-free spout sippy cup for toddlers features a Vari-Flo valve that allows liquid to pass through only when your little one sips Insulated base helps keep drinks cool and protects furniture from a "sweating cup" Ergonomically-shaped base is easy for little hands to hold, and the carabiner makes it easy to take on-the-go Clear cover is included to help keep the spout clean