Momcozy breast milk cooler adopt 360° surround cooling tube technology keeps temperatures consistently cold for over 24 hours, preserving the freshness of your breast milk and preventing nutrient loss during outdoor activities.Just pop the cooling tube in the refrigerator (around 0 ) for 12 hours beforehand (adjust freezing time as necessary), and then move it to the milk cooler for easy use.22oz individual storage bottles catering to your storing and feeding needs all day long. To accommodate multiple pumping sessions, use the 2 separate bottles to divvy up warm and cold milk, eliminating spoilage and ensuring your baby's health is safeguarded.The inner bottle can be cleaned and sterilized in Momcozy bottle washer, freeing busy moms from manual cleaning.