I'd like to give it zero stars.
Totally inadequate.  Falling apart.  It comes with no directions, so the first night after it arrived, I was struggling with it, trying to figure out which strap goes where, and how to put it on.  I couldn't quite figure it out, so decided to put it aside, and try again in the morning.  Then when I looked at the chin strap in the morning, I noticed that it was already falling apart, because of the stretching when I tried to put it on the first time.  It had begun to rip near the seam in the part that goes directly under the chin.  And on both sides of that seam, the cloth which had originally been glued to a foam rubber material on both sides, had now become detached on both sides.<br /><br />The general design, the way the straps wrap around the head to secure the chin, seems good.  But this device needs to be made of far more robust materials, so that it is not easily destroyed by just a little bit of stretching.<br />----------------------------------------------<br />Addendum, Jan 7, 2018: After buying and trying out a more robust chin strap that follows this general design, with one strap going over the top of the head and the other wrapping around behind the head, I am now of the strong opinion that none of these anti-snore chin straps are likely to work well, because the whole idea of the design is wrong to begin with.  The fatal flaw is that they all pull your chin in the general direction of your ears.  And that's where the hinge of your jaw is.  This hinge is the TMJ (temporomandibular joint), and it is right in front of your ear canal.  If the strap pulls your chin in this direction, it will produce no torque whatsoever to close your jaw.  In order to produce any torque that would help keep your mouth closed, the force exerted on the chin should be tilted further up toward the nose.<br /><br />I have also explained all this in a review I posted yesterday for that more robust chin strap that I just mentioned.  Here's a link to that review:<br />Why anti-snore chin straps don't work<br />https://www.amazon.com/gp/customer-reviews/R17G6H9L1ZH981/ref=cm_cr_arp_d_viewpnt?ie=UTF8&ASIN=B075ZNNFMG#R17G6H9L1ZH981
Rating: 1 stars