It’S The Best Thing To Happen To Feeding Since Nipples. Nursh’S Revolutionary Air-Free Feeding Design Features A Silicone Pouch That Collapses As Your Little One Drinks, Squeezing Out The Nasty Gas-Inducing Air That Causes Colic. No Straws, Vents Or Valves Here—So It’S A Snap To Clean And Assemble. The Silicone Can Even Be Boiled, Sterilized, Microwaved And Frozen.