We would like to share some testimonials from some of our customers that helped give our Silicone Sippy Spouts a 4.0 star rating on Amazon. You can find this review and others like that at our Goglass Amazon Store.
These are great! We tried several different transition sippy spouts and didn't really have a lot of luck. The others were a soft silicone, which seemed to collapse easily, resulting in my son just making a mess all over himself and getting frustrated. These, on the other hand, are a hard silicone so they definitely hold up to him better. We use the Avent bottles, and I also liked that these worked with them so I didn't have to buy all new bottles. I should note they fit the CLASSIC Avent well, but they don't seal well with the NATURAL. I had plenty of both so no issue for me. Great purchase!