I wear the i4's. I've tried the Sly mask and hated it. The ear muff things are horrible, they muffle sound too much. It feels comfortable for the most part, but the Dye mask is a tighter profile. I've got an average size head for a six foot tall person and the Dye mask fits me fine. I've never taken a shot in the jaw yet and I've been wearing them for over a year.