Our anti-colic nipple is part of the Airflex venting system, air is vented into the bottle and away from the baby's tummy. The ribbed texture prevents nipple collapse and reduces feeding interruptions and discomfort. Anti-colic system proven to reduce colic* Our clinically proven Airflex venting system is designed to reduce gas and colic. As your baby feeds, the valve integrated into the nipple flexes to allow air into the bottle to prevent vacuum build up and vents it towards the back of the bottle. It keeps air in the bottle and away from baby's tummy to help reduce gas, spit-up and burping. 60% less fussing at night* Philips Avent anti-colic bottle reduces fussing. Babies fed with Philips Avent antli-colic bottles experienced 60% less fussing at night, than babies fed with a leading competitor's vented bottle. * Nipple shape and ribbed texture prevents collapse The nipple shape allows secure latch and the ribbed texture helps prevents collapse for uninterrupted, comfortable feeding. Nipple shape designed for secure latch The nipple is designed not to collapse, for a secure latch and uninterrupted feeding. Compatible range from breastfeeding to cup Mix and match our breast pump, bottle and cup parts, and create the product that works for you, when you need it! This nipple is BPA free Philips Avent anti-colic nipple is made of BPA free material (silicone). Compatible with Anti-colic range Full Compatibility with Philips Avent Anti-colic bottle with or without AirFree vent. Specifications 2 pieces; Fast flow nipple; 6m+; Silicone; BPA free;.