Our Closer to Nature li"l sippee spill-proof first cup is intuitively designed for a leak proof, bite free easy transition from breast to cup. Made of soft silicone to be easy on tender gums, our integrated valve was designed by a physicist to provide goof-proof, easy drinking, and yet remain truly spill-proof. And the one-piece valve is super easy to clean and comes with a hygienic cover to keep clean when out and about. The top and spout are interchangeable with all the li"l sippee cups as well as the Closer to Nature bottles. The entire line of li"l sippee cups is designed to support baby"s oral development for first transitions. Contains 1x 9oz cup. BPA free. Tommee Tippee is the number one brand of infant and toddler feeding products in Great Britain. Since 1965, Tommee Tippee has earned a reputation for its clever ideas, product quality and simply intuitive designs that promote natural development at every age, stage and feeding need. These smart ideas have earned the company top ranks in the prestigious Mother and Baby awards, a head-to-head assessment of competitive products voted on by moms themselves. In fact, the Tommee Tippee Closer to Nature line of baby bottles has been chosen as Great Britain"s best baby bottle, winning the award in 2006/7, 2008/9, and again in 2009/2010. Today, Tommee Tippee innovations provide comfort for babies and peace of mind for parents in 45 countries around the world.