I was given a brand name version of one of these a year or so ago and found that it was really good to help cut the wind in subfreezing temperatures in Appalachia.  I was a little shocked at how much the brand name version was sold for online and elsewhere and decided to try a more generic version.  We got these and have been completely satisfied.  I think the material may be slightly thinner than the name brand, but the performance appears to be equal....and we got 6 for about what one of the brand name cost.