The Barrack Warden called the stuff "Iron Jute", we called it 'hairy concrete'.
Definitely 'Iron Duke', not 'Iron Jute'. If beer was spilt on it, your shoes would stick to the floor - another good reason not to spill beer! When it first appeared, we asked when the carpet would be delivered as only the 'under felt' had been laid. Not impressed when told there wouldn't be any proper carpeting.
We had some in the Flying Club (it was 'free'....). It subsequently clogged and ruined a Dyson vacuum cleaner.
Dreadful stuff.