I can't speak for IMF type gloves, but from experience with every glove I've owned(quite a few), the weight is added to the length and width of the glove, not the front padding.
This ^
But it seems one can hardly apply it in this case.
On the other hand personally I do not use and will not use Winning for sparring. A waste of the nice gloves.
Some IMF or Rival RS-1 do a very decent job.
