The perfect size for little hands! Hydro Flask Just like the larger models, the 12 oz (354 ml) kid's bottle with straw cap is made of stainless steel and features double-wall vacuum insulation to keep drinks cool for up to 24 hours. Perfect for cooling off after playtime or training! The easy-to-clean coloured straw cap and durable Flex Boot sleeve make this water bottle the perfect companion for adventures. Please note that the wide mouth straw stopper is not leak proof and is not designed for use with hot drinks. This product is BPA and phthalate free. This product Hydro Flask is guaranteed for life by the manufacturer.