It a wooden floor. One of the sponsors are Junckers, a factory that makes wooden floors. I don't think it is slippery, you can hear the shoes on the floor like the old days Johansen www.badminton-nyt.dk
Look at the clothes Kenneth Jonassen was wearing in www.worldbadminton.net. It looked like they are playing beach badminton.
Wow! Jonas has a new hair cut! I think I preferred the Curly ginger locks though. Maybe he is trying to look more "threatening" to the oppposition!! lol