Bareback
This is the term given to mixed climbers who go without heel spurs.
Apparently Will Gadd won't climb with heel spurs anymore, and has repeated 'Musashi M12' without them and 'The Game M13' via a newer more difficult finish 'The Game Reloaded M13+' without them. His arguement is that the hardest, pumpiest routes can be turned into 'two hour hang fests pump free' as climber 'bat hangs' on the smallest of edges to depump.
To make the point of this hanging to de-pump, Ben Firth took 'permissable' tactics to their limit by hanging a lawn chair from a tool in mid crux and relaxed in it!!
there is an ethics discussion for yas! Is heel spurs and other such things cheating?