The First Years Insulated Sippy Cup features double layer insulation to keep liquids cold for longer, and an easy to clean One Piece Lid. Kids love the colorful and bright artwork on both layers of the cup, and parents love the innovative design. The double layer makes the cup sweat-proof, so that kids may grip the cup easily. And to make life even easier, all of The First Years Insulated Cups have interchangeable lids. This means you can keep the cup even when your child has grown out of a sippy cup spout!