Playtex Insulator Straw Cup Playtex Insulator Straw Cups are handy, leak-proof sippy cups that keep a drinks fresh and cool for longer periods of time than regular cups. Each has a specially designed built-in slider included with the flip-top straw lid that keeps the straw clean even while it is not being used. The soft straw cannot be easily removed from the top of a cup by kids. The cups are made of unbreakable, sweat-proof material, which prevents moisture rings forming on furniture due to condensation. Why You"ll Love It: Made from durable, lightweight material, these cups are ideal for the small hands of kids. FeaturesPatented Twist n" Click leak-proof sealInsulated walls keep the drink freshSlider helps keep straw cleanSweat-proof exterior prevents moisture ringsLightweight and unbreakable