Helmet camo scrim: how-to Thread the elastic cord through the slits, tie it at the back and pull it over your helmet like a shower cap. Finish off by pulling any excess material to the back and rolling it under itself to tighten up the cover. The zig-zag pattern is positioned so that it creates an opening for NVG mounts at the front. Our Helmet camo scrim is foremost made for high cut helmets, but can be used on most full/low cut helmets. Fitment on full/low cut helmets may require some tweaking