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So they're not leak "proof" but they are leak resistant as the seller claims. In fact, everything the seller claims is true. These are really nice and very easy to clean. Can be used as a sippy cup or with the straw. My one and only critique would be that it would be nice if the seller included a straw cleaner. But other than that small detail everything is wonderful. The seller even emailed me to check and make sure I got the cups in perfect condition and how to contact them if I need any help. I thought that was very sweet.
These cups are awesome but I wish the end of the straw had a nodule that made them impossible to pull out (like Starbucks cups). My daughter loves to yank the straw out which means smoothie spraying. Easy fix...just a suggestion.
They had a little yellow spot on the bottom but it’s whatever, they are really nice , cute and perfect for kids . I decorated cups for kids and I think this is the new cups that I would be selling. BUUUY THEM don’t read others people reviews. Order it and see it your self, your are going to love them .
In really wanted to love these but the lid pops off very easy. It also leaks around the straw if tilted over. I also found it to be very pricey for such a small cup that has a top that does not fit well.