Masontops Wide Mouth Mason Jar Neoprene Sleeve – Purple – Triple Insulated Cozy – 2 Sleeves Cover 16-24 oz & Quart Sizes

Customers find the mason jar sleeve fits various sizes, from 32oz to tall soda stream bottles, and works well for both hot and cold beverages, keeping drinks cold and preventing condensation. Moreover, the sleeve is easy to slip on and off jars, is sturdy, and provides good insulation. They appreciate its versatility, with one customer noting it's perfect for sodastream bottles, and another mentioning it's a massive upgrade for using mason jars as cups.