Add some more insulation to your Brewzilla! This is a Neoprene wrap-around cover designed specifically by KegLand for use with the GEN 4 9.25 gallon (35L) Brewzilla Electric Brewing System. This jacket will speed up heating time and allow a more vigorous boil. The jacket is constructed of 8mm thick neoprene and using your Brewzilla in conjunction with the jacket and in addition to looking cool and protecting from dents it results in a 10% faster heat up time, 50% less heat loss from the boiler, and is necessary to achieve a rolling boil on the USA 110V model. If you have a Brewzilla Gen 4 you need this and it is absolutely worth the price. This jacket fits only the Gen 4 Brewzilla.