Playtex Coolster Tumbler is a spill-proof, insulated cup designed for older babies and preschool kids. The Playtex Coolster insulated cup has a specially designed spout-less lid for kids who have outgrown their baby sipper cups but still need spill-proof protection. With the Twist "n" Click feature, the lid click closes with a simple twist and the cup becomes 100% leak-proof. It"s also well insulated to keep drinks cool and fresh for longer periods.