"The Nipple Is Of Perfect Shape And Size To Fit Into The Sucking Fossa Of The Baby. Inner Vertical Lines Make The Nipple Collapse Resistant. The Textured Surface Of Pigeon Nipple Allows The Baby To Latch On Easily. This Nipple Is Made Up Of 100% Silicon, Super Soft And Flexible, Allows Natural And Smooth Tongue Movement. The Unique Air Ventilation System Avs Significantly Reduces Gas Intake, A Potential Cause Of Gas, Colic, And Reflux."