My only issue here is with the seller! This product tends to turn though, i find myself readjusting it regularly. Exactly as advertised and arrived very quickly.

These are perfect for the phillip avent bottles and they fit great. They were the perfect size, they slip right on, easy to clean, does protect glass. They fit great on our avent 4oz.

And yet they don’t work remotely well - sorry, i am in disbelief with how poorly these things fit. Seller is also bad with customer service so don't buy unless you're sure you want it.

The 4oz size is worse, it slides on and off easily (absolutely no need to wet it or the bottle as other reviewers say is needed - makes me wonder who posted those reviews. It is very difficult to slide over the bottle even after using water per their ...  Read More

After getting over the grime, it's tactness also doesn't allow the bottle to easily slip into pockets or cup holders. It makes it more difficult to read the bottle's ounce markings. With shipping they cost more than the bottles themselves.