The Evenflo Feeding Vented + Angled Bottle helps promote a semi-upright feeding position for your baby. This uniquely shaped bottle, with soft grip sides, is easy to hold and allows your little one to have a comfortable feeding experience. The included Vented + Slow Flow Nipples are 100% silicone and feature 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 + Angled 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.