Enjoy optimum drinking temperature for hours with this leak-proof lid and built-in straw, compatible with the Hydro Flask kids' bottles and Hydro Flask Wide Mouth bottles: 591ml, 946ml, 1180ml, 1893ml. The lid cap features Honeycomb Insulation that keeps drinks cold for up to 24 hours. The design allows you to drink with one hand. Whether you're going to work or taking a morning yoga class, use the convenient finger loop for easy carrying and the straw for sipping. Made from high quality and safe materials, the lid is BPA-free and toxin-Free. It's easy to clean and dishwasher safe. Good to know: The Wide Mouth Straw Lid is not intended for use with hot liquids.