The Hydro Flask Wide Mouth 355 ml children's drinking bottle has a size that is well suited for children's hands. Just like the big Hydro Flask bottles, it is made of high-quality stainless steel with double-walled vacuum insulation. It keeps your cold drinks refreshingly cool for a whole 24 hours - perfect for a break or after a workout. It also features a colourful, easy-care straw lid and a sturdy flex-boot. However, its non-spill Wide Mouth Straw Lid is not intended for use with hot drinks.