To put this review in perspective, I wear an extra-large (7-3/4) hat size. This face mask fits me without over-stretching.  The eye port is a bit small, and with my glasses on, the bottom of it can rest below or above my nose (the latter can cause glasses fogging). When you need a face mask, you need one. A watch cap won't do. This is a thick (two-layer), well constructed face mask that fits me snuggly.  However, it may be too large for the smallest head sizes.