Membrane, by Restomod Air is the only true thermal insulation with sound dampening material. We found that custom car builders were using standard “sound dampening” material in their builds, and were unaware that it did not provide insulation from the outside elements. Membrane four-layer material that prevents your vehicle from being robbed of the climate control temperature you have set in the cabin, while giving you sound dampening.
http://www.restomodair.com/shopprodu...mal-insulator/
http://www.restomodair.com/?p=7221&p...b&preview=true