These sippy cups are wonderful! My son hasn't been able to figure out how to use the sippies that require you to bite down on the spout while sucking. These cups deliver the beverage with sucking only. They're study too, which is important since all kids chew on their sippy cups. They are not leak proof though--so we continue to use his Born Free sippies for travel. Get more detail about Tilty 2 Pack 7 oz Ergonomic Design Sippy Cup Set of 3 2packs.
