The first hardshell I had was a Bell Mark 1. (The one depicted on the right.)

Hated it, might have used it only a few times. I dissed hardshells and only until some years later acquired a better developed model from Bell. The Mark 1 had no vents, the styrofoam was a heat insulator and also troublesome was the cheap sponge foam padding strips. The tape like adhesive would get all sticky soft and the padding moved around. The straps were fine with the nylon but used D-rings as tension and closer chin strap. Annoying without having a fast / snap clip.