Best keg mashtun insulation

I did a search and found all the opinions, everyone chime in on what is the best. Fire retardant, temperature efficiency, removable, aesthetics, ease of use.
along with the duct tape and blanket method this is what I've found as options, so which one is it?
closed cell foam sleeping pad
reflectix
yoga pad
water heater blanket
Closed Cell Sheet insulation
Ceramic fiber paper
Engine compartment insulation

I use a water heater blanket I got at Home Depot. I sprayed one side with adhesive and then folded it in half to make it thicker.

Monster Mash said:

I use a water heater blanket I got at Home Depot. I sprayed one side with adhesive and then folded it in half to make it thicker.

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I understood that these were flammable, but it looks like yours is pretty low to the burner.

Don't everyone answer at once I went and bought reflectix today, I will post a picture when it is complete