This is a closed cell foam with a silver foil back and is self adhesive. 
This is the insulation we use in all our bespoke builds it also helps reduce noise. 
We only sell tried and tested products that we are happy to put our name to. 
This is good quality and can easily be cut with a sharp blade. 
8mm thick foam  reducing heat loss thanks to its low U value.
Closed cell foam so no water absorption that might lead to damp or bad smells
Inner face coated in aluminium foil - improving your radiative heat insulation.
Provides an amazing amount of acoustic insulation