360˚ drinking edge for natural sipping: Designed so children can drink from any side of the rim, supporting a more natural drinking position Supports the move to open cup drinking: Encourages an easy transition from spout or straw cups to an open cup or glass Leakproof valve: Innovative valve technology allows liquid to flow only when your child drinks, helping to prevent spills at home or on the go. Simple two piece design: Made with just two parts for quick assembly and effortless cleaning, saving time for busy parents. Premium Tritan material: Crystal clear like glass, extremely durable and odourless.