Very disappointed when I got the package and read in fine print on the back that they were only 55% cotton.  I looked at the ads very carefully because my husband can't wear synthetic fibers.  All it said was cotton which I assumed was all cotton.  I see now that on one line it does say blend.  So I have no grounds for returning it and it will go to the homeless shelter as I did not open the package.  But FYI it's only 55% cotton/45% polyester.  So if your husband is comfortable in plastic underwear, he may be happy with these.