This is where the board is flat on the snow. Whilst flat-basing it is possible to 'catch an edge' which will usually put the rider off balance. The primary cause of this is attempting to flat-base where flat-basing is not suitable e.g. a transitioned piste. It is the fastest position snowboarder can assume as there are no forces actually against the snow (as with carving) just a little friction on the bottom of the board.