Safe & Secure: Leak-proof silicone seal around straw opening and spill-proof valve prevents messes BPA-Free: Constructed from 100% BPA-free materials for safe use Non-Slip Base: Soft-grip bottom prevents slipping and tipping Convenient: Fits most car cup holders and is top-rack dishwasher safe Easy to Clean: Straw twists apart for easy cleaning and the lid and body are also dishwasher safe Ideal for Ages 3 and Up: Perfect transition from sippy cup to a big-kid tumbler Fun Mermaid Design: Brightly patterned design that kids will love