insulation for mash tun

[johnnynothumb]

I am using a Sanke keg for a mash tun and I need to locate an insulator.
does anyone have any suggestions

[Grizz]

I was looking in to using foil covered bubble wrap on my mash tun. Also was looking at hot water heater insulation wrap kits. Bubble wrap seems better because it will not soak up spilled wort or water. And it can be removed easily for cleaning or to dry it out.