I followed the sizing given and ordered a large. When it arrived I couldn't wait to put it on. That was when I realised I should have bought a medium as there's so much stretch a medium would have been a nice second skin fit. The mask is great and I plan to keep it but as others have said the nose, chin  and eyes don't match up 100%, but it's close enough for a budget latex hood. I love the feel and the latex smell of the mask when I'm wearing it. Home alone the other day I decided to test it out for long term wear and wore it all day, I was surprised I didn't sweat in it as much as I though I would.