Bear Necessity recently moved to Club Air. I think this is a bad move. In addition to buying a ticket to the party, you must also buy their Air Card. You cannot use cash to pay for coat check and drinks. Check the Club Air website to see what this is going to cost you. Getting a refund is difficult and bureaucratic, so that people won't bother. The Air Card is a rip-off. Twenty euros is really too much money for this party.
Bear Necessity started as a bear party, but has become more a general gay dance party for real men.