BrewBuilt™ Neoprene Carboy Sleeve

BrewBuilt™ Neoprene Carboy Sleeve

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The BrewBuilt Neoprene Carboy Sleeve works great for maintaining the internal temperature of your 5, 6, or 6.5 gallon glass carboy. Highly recommended for use with the BrewBuilt Carboy CoolStix. The added insulation will lower the amount of cycles needed to maintain fermentation temperatures and greatly assist in cold crashing. The sleeves are 6 mm thick with stitched piping on the edges for exceptional durability.


SKU Size Height (in.) Diameter (in.)
FE329A 5 Gal 14.75 10.75
FE329B 6 Gal 17.25 10.90
FE329C 6.5 Gal 17.50 11.20


Community Q&A

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Browse 2 questions Browse 2 questions and 2 answers
Does this fit the 7 Gallon Fermonster?
Colten Zachary on Apr 28, 2020
BEST ANSWER: The size you will want for the 7 gallon fermonster is the FE329C made for the 6.5 gallon glass carboy. The Fermonster is 11.3" diameter and the jacket will stretch that last 0.1" to snuggly fit the fermonster.
Is there any reason this wouldn't work as kettle insulation for a 5-6 gallon kettle (Like the SS Brewtech)? I do electric BIAB and the dimensions are almost perfect for that application. With an induction cooktop I doubt the kettle would get hot enough to melt the neoprene. Thoughts?
Tysen Bibb on Apr 17, 2020
BEST ANSWER: This should work fine for that application since you are using an electric heater. Neoprene seems to have a burn/melting point over 250 degrees fahrenheit so it should be safe. That said I do recommend watching it diligently for the first few brews and you should always have a good fire extinguisher at hand any time you are brewing with any system just in case.

4.5 / 5.0
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1 Star
I works great with a 6.5 gallon Big Mouth Bubbler.
June 7, 2020
2 months ago
Carboy Sleeve
Great fit and seems durable!
April 22, 2020
4 months ago