What is it? A sippy cup with a silicone mouthpiece.
How does it work? The lid has a plastic ring that you insert the silicone mouthpiece into and screw that onto the cup portion.
Cool Features: It's a much nicer design as opposed to having the small and very losable sippy valves. Downside: the lid can be screwed on wrong very easily and the child can easily move the silicone part and allow leakeage but I'd rather have a cupboard full of these than deal with other sippy's.
Practical Point: This is just a good sippy to have because it's easy to find the pieces and get it together quickly.
$$ Savings: Check your local Target or baby store but also it's available online with Amazon Prime.
Do I recommend it? YES!
Quantity Recommended: 4+