not comfortable with the strap
The strap behind the neck is not long enough and requires more flexibility so it's not causing tension from the back of the neck to the upper part of the nose where the mask is being pull against the upper nose when you tilt your head up. If the mask can be redesign for more flexibility allowing you to rotate your head with no discomfort I would give this mask a 5 star. I can get the strap over my neck but that will be to tight with alot of discomfort.
Rating: 3 stars