Halfway

Works halfway, ie, opening the jaw during sleep is indeed prevented, but that applied to the chin portion of the tape is not cut in registration, as the 541er. And the upper part of the band expresses a one to the course and the width of the band corresponding depression in the head. This is - for me anyway - even two hours after getting up significantly felt. Loose but you can not adjust the belt, otherwise not have the desired effect. Also, the band always suppressed somehow to the ears, which is annoying when sleeping on the side.
In my view, would be a headboard / upper part in the form of greater Kipa of reticulated fabric with two leading around the ears fabric strips that would keep the chin and fix, better.
But after all, the band already now holds the jaw closed while sleeping and that my mucous membranes in the mouth and throat dry out no longer - and that's' what.