Want to insulate my new cargo van. Found a cotton thermal/acoustic insulation product. Rather expensive.?

We have a fleet of 6 cargo vans and we transport temperature sensitive candies. We recently fitted them with Foil/Bubble insulation. It works great for keeping our vehicles at a moderate temperature, especially great for keeping it cooler during those hot summer days. It also dampens noise fairly well. I looked at several companies but found the best price from ECOFOIL. I think its www.ecofoil.com.