Quick answer: The X-Vision Mid 2.0 is Mares' low-volume freediving and scuba mask sized for medium faces. It's a strong choice if your face runs average or narrower. If you have a wider face, start with our wide-fit picks instead.
We'd rather tell you up front than have you find out at the dive site: Mares built this one for medium-sized faces. That makes it a great mask for a lot of divers, and maybe for your dive buddy, but it isn't the mask we'd hand someone who's been fighting temple pressure or cheek gaps. For that, browse our Wide-Fit Scuba Masks, or read Wide Face Dive Mask Options That Actually Fit.
Hold it to your face without the strap and breathe in gently through your nose. It should seal without the strap doing the work.