Nuby's Flip-It Boost cup is great for travel and on-the-go sipping. The cup features our flip-top cap that helps prevent drips and spills. When flipped shut, the Flip-It top tucks out of the way, protecting the straw when not in use. Nuby has designed the Flip-It Boost cup with a soft silicone straw that is gentle on children's teeth and gums. The cup base features fun colors and prints that are sure to make little ones smile. Nuby always keeps your child's health in mind. That's why Nuby uses durable, BPA-free materials. With Nuby's Flip-It Boost cup, spills and leaks are a distant worry on your family's adventures.