Tommee Tippee Explora Truly Spill Proof Insulated Straw Cup is intuitively designed for guaranteed easier drinking and more natural transitions, our Advance-Flo Technology ensures that our truly spill-proof straw Cup is truly spill-proof, leak proof and easy to drink from, easing the transition from mealtime drinking to on-the-go active drinking. Unlike other valve systems, our Active Sensor valve is designed by a physicist to be both so sensitive that liquid flows on demand, yet truly spill and leak proof which makes this the perfect Cup for kids as they learn to get up and go! BPA free 2pk 9oz insulated bottles. 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 Gold Award in 2006/7, 2008/9 and again in 2009/10. Today, Tommee Tippee innovations provide comfort for babies and peace of mind for parents in 45 countries around the world.