Suppressors tend to get very hot very quickly. This produces a mirage effect when looking through the scope. Wraps made of high temperature materials help mitigate that and also allow the shooter to remove the suppressor without having to wait until it cools down.
Since we’re all going off what is visible and nothing more: the outer bits seem to be fabric, maybe those are dirt covers?
Suppressors tend to get very hot very quickly. This produces a mirage effect when looking through the scope. Wraps made of high temperature materials help mitigate that and also allow the shooter to remove the suppressor without having to wait until it cools down.