It features interchangeable parts that fit all Phases cups. Phase 3 for children ages 18m+. TherMax double wall vacuum insulation for maximum cold temperature retention. Kid-proof design, unbreakable stainless steel interior and exterior. Hygienic push button lid with pop-up silicone straw is easy to open. Contoured body is easy to grip. Dishwasher safe. Capacity: 10 oz. Dimensions: 2.9" W x 5.3" D x 7.5" H. Keeps Cold - 10 hours.