Clinical tests prove that warm milk or formula provides superior nutritional absorption. Now you can keep milk warm throughout the entire feeding with MilkBank"s insulated feeding bottles. Its unique design insulates the inner bottle with air, or warm water for longer feedings. MilkBank"s triple vented cap delivers unrestricted milk flow to prevent colic, spit up, burping, gas, and fluid in the ear. Making feeding a happier time for all. Plus, our patented leak proof filter system means your bottle will never leak.