Dont waste your money!
I bought one a few months ago and they are complete and utter rubbish. I wrote to the manufacturer and complained and never heard back!
They leak everywhere, and barely anything comes out. It was for my 18month old and he struggled, so my 4 year old tried it, he struggled too. So I tried it, and OMG All that came out was a few drips at a time, and you have to suck quite hard. BUT as soon as you tip it up o drink like you would a normal cup, liquid just flows out the rim! I thought it was me not using it properly, so DH tried, same result and a friend tried, she had the same result too! It leaked everywhere!
And for the company to not even contact me back....well. What can I say? And I live in the same town as they make them!