The Pura INSULATED sippy cup features a double-wall vacuum insulated stainless steel bottle (18/8), and medical grade silicone components including XL Sipper Spout, travel cover, and sleeve. Like all bottles in the Pura Kiki collection, the Pura insulated sippy cup contains zero plastic parts! The included silicone sippy spout is a fast-flowing spout that helps your child transition from a bottle nipple. Ideal for children 6 months to 4 years, this sippy cup is compatible with all silicone components from Pura including our Natural Vent Nipples in various flow rates, Silicone Straw, and sealing disks. Each cup has pressed internal volume marks that can be clearly viewed on the inside of the bottle for easy measuring. The bottle is also compatible with nipples and spouts from other brands. With Pura you can rest assured that you are always using the safest and most eco-progressive bottle on the market. One Life…One Bottle.