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The innovative air-free feeding design features a 100% silicone pouch that collapses as your little one drinks, squeezing out the gas-inducing air that causes colic. No straws, vents or valves, so it's simple to clean and assemble. The nipples have an optimal shape and length for a great latch. And the only thing milk comes in contact with is 100% silicone. | Boon NURSH Silicone Pouch Bottles in Speckle Size 4 oz.