BrewSnug25BrewSnug25. The BrewSnug25 is a neoprene fitted jacket with built in temperature controller and heating band designed specifically for the BrewKeg25. A thermostat probe attaches directly to the sediment bottle to read the temperature where it matters most. As a stand alone heating device, the BrewSnug25 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