Designed with an extra-durable construction and a soft-feel silicone mouthpiece, the Frank Green Flip Straw Lid & Strap - Cloud provides a convenient, one-handed hydration solution. Just slide the button to flip the mouthpiece up, allowing for touch-free sipping. Enjoy a fantastic drinking experience with this lid. Benefits : Enjoy easy, touch-free, one-handed hydration on-the-go! Universally fits all frank green bottle sizes. Slide the button to release the mouthpiece. Made from new extra durable copolymer material. Soft-feel silicone mouthpiece for comfort. Perfect for gym days or nail salon days!