Warm but quality is lacking

This mask is shockingly warm for how thin the material is.  I'm truly shocked that it provides as much warmth as it does.  It also fits great.  I was worried that it would be too tight but that isn't the problem at all.  It is almost like it was custom made because it fits so well.
My only complaint is that it has started to come apart at the seam.  I'm going to try to fix it, because I don't want to go through the hassle of returning it and because that would leave me without it during a very cold period of time where I live.  I don't want to deal with either of that.