Forgot to add, if you remove the grills from the ksc75 the bass will diminish a little and the sound become clearer. Certainly a mod I prefer. Now, by putting the ksc75 into the earmuffs, you get a darker and less airy sound, but with this mod you compensate it. The Ksc75 have the flexibility then to work both as open clip-on cans (with the clips) and as closed super isolated cans (without clips inside the earmuffs), isolation will be superior to that of the very best of closed full sized cans, that's to say: it will isolate more than hd280. And here's the best: weight and clamping force will be substantially lower than hd280 and most closed cans. Sweat depends on the pads in my experience. The cons are: the koss can move their position inside the cups, since they aren't fixed there (unless you make them be). And if you remove the grills completely, then there's the risk of touching the drivers themselves with your ears, eventhough you leave the foams put, and this can cause the drivers to dent which needs repair: remove the foam and stick the drivers with your fingers or something slim and watch where the dent is, just like when a mineral water bottle gets dent (similar).
