[header] How to insulate a beer keg [title] Purchase the appropriate size keg cozy for your keg. [step] The most straightforward and often most effective way to insulate a keg is by buying a specialized " keg cozy. " these insulated jackets are usually made from neoprene and are similar to smaller can cozies designed to insulate aluminum cans from the warmth of your hand. 
[substeps] Keg cozies can be purchased from some home brewing supply stores and from specialty manufacturers. Searching the internet for suppliers is the best way to locate and purchase a keg cozy.