Evenflo® Classic Zoo Friends Bottles. Breastfeeding. Best for baby. Decorated. Reduces gas. With Micro Air Vents™. Without BPA. Soft and flexible, Customflow™ nipples sense baby's pressure and respond with the right amount of liquid. Micro Air Vents™ help to prevent or reduce nipple collapse and minimize air ingestion. Customflow™ nipples come in slow, medium and fast flow to meet your baby's changing needs. Works with Comfi™ classic' and Comfort Select™ bottles. CustomFlow™ nipple adjust to baby's pressure. Micro Air Vents™ keep air out of baby's tummy. Parentlink Answer Advice Affirmation™. www.evenflo.com 1-800-233-5921 8:00 am-5:00pm. Trademarks and associated logos are property of Evenflo Company, Inc. ©2010 Evenflo Company, Inc