Love this cup for my morning tea. I can microwave the base at work, easy to clean, stays sealed, easy to drink. I've busted like 4 jars-well my students broke one, but the shell survives. I bought stainless rings eventually. I have two, use them every day, it fits in my car's cup holder, and haven't lost the cork but do have cork corks lying around just in case. Enjoy!

Love the sleeve. A bit snug but easy enough to roll down the side of jar to remove. The little plug is a nice way to reduce chance of major spill.
The mouthpiece is the issue. Despite repeated hand washing in warm soapy water upon delivery, the mouthpiece has a weird taste which reduces the enjoyment of the coffee or tea inside the jar!

I've started using the 24 oz mason jars for my smoothies but I didn't want it to spill so I found this set. The hole is large enough to use a silicone straw suitable for smoothies. It's hard to put on the sleeve but then you want it secure. I was concerned about losing the plug so I used an 8 inch rubber band, tied a knot around the plug and hang it from the jar. I got mine from the post office I think, but these look like the same thing: Extra Large 8 Inch White Big Postal Rubber Band - Pack of 30 Pieces.

I was looking for something my husband could use to take his coffee in to work. He used a mason jar, and I had to find something to compliment it. I came across this set, and thought it would be perfect.

I ordered one (blue) to "test" it out, and was very satisfied. My husband says he does still feel the heat, but not nearly as much as before. The spout is great and has no leakage at all. The color is very nice as well, not to bright and loud. Only downside (which is why it didn't get 5 stars) was the amount of time it took to put the cover onto the jar. I made sure to reiterate to my husband not to take it off because it took about 20+ minutes to get it on all the way. I used a wide mouth BALL jar which seemed to be slightly wider than the cover. It fits well, just takes A LOT of effort to put on. Not sure if another brand of jar would be different.

Overall, very happy with the purchase and will be ordering another one (in purple) for myself.

I absolutely love this & use it all the time. ALL the time! To remove sleeve, just get it good & wet, wiggle it a little & it slides off.