The rim of the Wonder Cup is waterproof and made from silicone, making it easy to clean. With a light press of the lips, the flow of the drink starts and the drinking speed can be adjusted. Ideal for use on the go, the Wonder Cup is designed according to your child's needs and abilities, providing perfect assistance for them to drink like adults, as the 360° perimeter allows drinking from any part of the cup. Hygiene is our priority, which is why Nuby has designed a practical protective lid for the Wonder Cup that makes cleaning easy. Naturally, cleaning in the top rack of the dishwasher is simple. The Easy Grip handles are specially designed for your child's small hands, making it easier to hold the cup.