[vxNsr]

Just curious to understand how does a mask over your mouth keep the sun off of your face (presumably the eyes)?

[accoil]

Could be to stop sunburn. Hat with brim protects the top half, and keeps it out of the eyes. Mask protects the lower half.

[MyHypatia]

Yep, I wear a hat and a mask. Keeps the sun off of most of my face.

Sometimes I forget the hat or the mask and then I just wear one.