The Evenflo Feeding Vented Clear Bottle delivers a twist on an iconic, classic design. The colorful bottle has a unique, ergonomic shape is lightweight and easy-to-hold, making feeding time comfortable for both you and your baby. The included Evenflo Feeding Vented + Standard Neck Nipple is 100% silicone and features an integrated 1-piece venting system to help reduce the potential for colic, reflux, gas, and fussiness. The nipple has a gradual transition between nipple length and base to allow your baby to maintain their latch. Made from BPA-free polypropylene, the Vented Clear Bottles have molded measurement markers in both ounces and milliliters to provide an easy and accurate way to measure the volume of liquid. These dishwasher-safe bottles (top rack only) are compatible with all Evenflo Feeding breast pumps, as well as most other standard neck breast pump brands. The bottles and nipples are 100% free of BPA, polycarbonates, PVC and phthalates, and are also made of FDA-approved food grade material.