Designed to gradually develop the child's drinking skills. . Bite resistant spout that mimics the first approach with the straw, allowing the child to place the mouth in "O". . Shaped spout to favor the right positioning of the lips and off-center to facilitate the correct posture of the neck during drinking. . Innovative removable, removable Sorso valve, patented to guarantee the anti-drop seal of the cup without compromising the child's ease of drinking.