Large enough & neck leash is huge plus.
Finally, a mask that covers my mouth and nose without coming off if I talk.  The neck strap seems to be an "oh duh" innovation.  Where I work I have a private office so I can unmask in it.  The neck leash is extremely conveinent for frequent on and off masking.  The only thing missing is a nose forming wire. Which if you wear glasses (or goggles)  is a nice addition to reduce fogging.
Rating: 5 stars