Secure Yet Flexible Fit: Engineered to fit snugly so it won’t slip off, while still stretching enough to be easily put on and removed from a variety of jar sizes.

Family-Friendly Colors: Choose different colors so each family member can easily identify their own jar. The sleeve can also help block light from the contents of your jar or provide a little privacy for what’s inside.

Microwave, Freezer, & Heat Safe: The sleeve can stay on your jar in the microwave, freezer, or while handling warm drinks and foods. It’s a convenient option for heating drinks, warming jarred food, or using frozen Mason jar meals.

Easy Cleaning & Dishwasher Safe: Since the sleeve usually doesn’t touch your drink or food, it often just needs a quick rinse. For best results, wash the sleeve separately from the jar to avoid trapped water. 

Customers often call these Mason jar sleeves koozies, cozies, coozies, kozies, jar insulators, or insulating sleeves. Whatever name you use, they help make your Mason jar easier to grip, more comfortable to hold, and better protected for everyday use.