"The 11oz straw bottle is the ideal bottle for Pre-K to early elementary school kids. Our 100% medical grade silicone straw top eliminates distracting drinking or lid removal noises of traditional bottles making them a teacher’s favorite! True to our plastic-free mission, our straw bottle is 100% plastic-free unlike other bottles that use plastic components in their straw bottles. With Pura, you can be sure you are getting the safest, BPA/BPS-free and toxin-free bottle on the market. General Instructions: Wash before first use. Boil for 5 minutes to sterilize. Remove the sleeve from the bottle at least one time per week to clean between the bottle and sleeve, more often in humid climates. Dishwasher safe. How to install sleeve: Add baking soda to the inside of a dry sleeve then slide onto the bottle. Rinse thoroughly. OR At the sink, spread a pea-sized drop of liquid dish soap inside the sleeve then slide the sleeve onto the bottle. Rinse thoroughly."