The BrewSnug10? is a neoprene fitted jacket with built in temperature controller and heating band designed specifically for the BrewKeg10?. A thermostat probe attaches directly to the sediment bottle to read the temperature where it matters most. As a stand alone heating device, the BrewSnug10? allows brewers to maintain a minimum brewing temperature for fermentation without the need to tie up a beer serving fridge for the same purpose when you would prefer to be drinking from the fridge! The BrewSnug10? has been tested to an ambient surrounding temperature of 4 degrees Celsius, at which it is able to maintain a 20 degree Celsius brewing temperature for the BrewKeg10?