Our cap and sleeve fit on virtually any 8oz canning jar. The sleeve is easy to remove and can be left on the cup for washing. How’s that for convenience?

IO’s cap is specifically designed without small parts, like the easy-to-lose valve. According to the ADA’s recommendations for better dental development, children over the age of one should drink from a cup without a valve.* Spouts can also be detrimental, as they tend to become chew toys. EIO encourages a healthy, natural transition to cups.

* From The Journal of the American Dental Association, Vol. 135, No 3, 387.