Joovy Glass Bottles

Any other moms and dads use the Joovy Boob glass bottles? We use these bottles when he goes to daycare. They use a bottle warmer to heat up the milk. The glass stays too hot for my babes to practice holding his own bottle. The silicone sleeves don't cover enough of the bottle to help any.

Anyone else use these bottles and run into the same issue? I was thinking of looking on amazon for something, but I'm not even sure what I should be looking for! 😂