I used this one for many many years, and even after that I gave it to friend as a gift, still in great condition.
I can say i never used something that is so heavy duty but in same time not looking so heavy duty.
Really good thing.
It is old style German military sweater, not sure is it still in use.
I just found link on Amazon, hopefully it is same quality.
This one here looks more like real thing but it is out of stock