- Locks milk in, keeps air out, for easy upright feeding- Teat stays full of milk, not air- Anti-colic system proven to reduce colic and fussing*- Easy to clean !#!amp!*! assemble, as AirFree™ vent is a single piece- Teat shape designed for a secure latch-on- Simple to use- Use your bottle with or without the AirFree™ ventWhat's included:2 x 4oz Baby bottles2 x 9oz Baby bottles1 x Bottle and teat brush1 x Orthodontic soother1 x AirFree™ vent