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Silicone Sleeve for 4oz Mason Jars


These silicone sleeves for Regular Mouth 4oz jars (the tiny ones) add grip and padding, and they also insulate. Use them for baby food, shot or shooter glasses, espresso cups, condiment cups, snacks, or anything else.

Whether you call it a Koozie, a Kozie, a Coozy, a Cozy, or just an insulating sleeve, it’s perfect for protecting your glass jar from breakage and your hand from cold or heat.

Made of food safe silicone rubber, these sleeves are dishwasher, freezer, and microwave safe. Silicone is a safe, non-plastic, BPA free material for food use that does not leach any chemicals.

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Quantity 5 - 14 15 - 29 30 - 49 50+
Discount $2.80 $2.63 $2.47 $2.14

Mix and match colors!

I use these as an adorable espresso cup. The silicone sleeve adds grip, looks great, and I love the feel of it in my hand.

We designed the sleeve to fit tight enough that it won’t fall off, but loose enough that it is still easy to get on and off. Different brands of jars will vary a little in size, but it should stretch to fit almost any of them.

Use a different color for each family member, and stop wondering which jar is yours!

This size does not have a hole in the bottom, so you can also use it without a glass jar inside.

Microwave safe means you can heat up your beverage without removing the sleeve. Or take out a frozen jar of food, put a koozie 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.

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Mason Jar Lifestyle

Customer Reviews

Based on 15 reviews
Bethany Novak (Berea, OH, US)
Nice quality

I got these for baby bottle covers and baby food jars. They’re thick and good quality. Easy to put on, but they don’t easily fall off. Nice selection of colors too.

Latu Anitoni (Provo, UT, US)
Adorable, perfect fit

These were the perfect fit, not too snug that you couldn't remove them, but not to loose that they fall off. They protect the jars, which is perfect because I'm using them for home made mason jar bottles

Rachel Carlson (Tallahassee, FL, US)
Slippery when wet

These sleeves (8oz and 4oz) do not fit snuggly enough in my opinion. They have decent grip when dry, but if they get the slightest amount of moisture ie. a dribbly toddler using a straw top on an 8oz jar, the sleeves slip right off. Fortunately the 8oz did not break, but we did lose a 4oz jar of baby food, again the jar sliding out of the sleeve when it encountered moisture from the food.
From prior experience with other-brand glass water bottles and fitted silicone sleeves, the sleeves should be a real struggle to don/doff.
Review posted to both 8oz and 4oz product pages.

Elissa Huang (San Francisco, CA, US)
As described

Very happy with the purchase! It is easy to put it on and take it off! The quality is great! Also I’m glad that I get to support small business by purchasing it.

Erica M

Does what it’s supposed to

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