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Newest version, with no groove at the top and a hole in the bottom. These fit current production Ball and Kerr half pint jars and 8oz quilted jelly jars. They will also fit most other 8oz regular mouth Mason jars.
Our kids use most of the half pint jars that are litter our kitchen, but I also use them to drink coffee and cocktails.
Microwave safe means you can heat up your beverage without removing the sleeve. Or take out a frozen jar of food, put a sleeve on it, and heat it up.
Since they don’t touch your beverage, I often just rinse them, but they are also dishwasher safe. You can leave them on the jar, but I find that water gets trapped so I prefer to separate them to clean the jar.
You could also use one to block sunlight or prying eyes from the contents of your jar.
Great for kids and adults!
2 Pack – Fits *Regular Mouth Half Pint* Jars – RM 8oz Mason and quilted jelly jars have straight sides and are 2 3/8″ internal diameter. They are a good size for kids, cocktails, coffee, wine, small beverages, or baby bottles. Check the pictures if you aren’t sure what size jar you have.
Prevent Breakage – Twice as thick as competing brands, for much better insulation and drop protection. We use glass jars instead of plastic cups for our kids’ beverages, and the sleeve helps protect them from breaking when they inevitably hit the ground.
Protect Your Hand From Hot and Cold – Perfect for heating up food or beverages in the microwave. No cut out areas that leave your fingers unprotected. Does not absorb condensation.
Multi Purpose – Coffee, cocktails, and soup are all tastier from a Mason jar. Add a drinking lid, or stainless steel lid & straw, to make a plastic free travel mug. Or add a leak proof lid and bring lunch to work or school.
Food Grade Silicone Rubber – Dishwasher, freezer, and microwave safe. Silicone is a safe, BPA-free material for food use that does not leach any chemicals.

This little guy lets me pack my small mason jar without fearing it will break. No plastic in my food and no disposable items to hurt the environment. Durable, attractive and clever.