This Green Sprouts Spout Adapter for Water Bottle quickly converts a standard bottle of water for child use. Going out is simple and easy with the Spout Adaptor because it fits on a standard bottle of water. The combination sippy and straw spout is made from silicone and encourages healthy oral development. Its small size saves space and provides a back up to the everyday sippy cup. Features: Combo sippy and straw spout Collar fits two standard bottle sizes Travel cap keeps spout clean Materials: silicone and polypropylene