The Hydro Flask Kids' 12 Oz Wide Mouth Bottle is made with the same stainless steel and double wall vacuum insulation as the brands bigger bottles. Every sip stays icy cold for up to 24 hours, so when recess or practice wraps up, the perfect refreshment is waiting on the sidelines. With a colorful, easy-to-clean Straw Lid and a durable Flex Boot this is the perfect companion for any adventure, big or small. Note that the Wide Mouth Straw Lid is not leakproof and is not intended for use with hot liquids. The Hydro Flask Kids' 12 Oz Wide Mouth Bottle is just the right size and fits perfectly in your littles ones hands.