Review title is Do the job but they're not made of cotton, as advertised. [SEP] Was looking for a sheer cap to protect my hair when I use my CPAP headgear.  Did the job but I really wanted a sheer breathable cotton cap, though this thin polyester one is acceptable -- was just not what I paid for, and I probably won't continue to use.  But I kick myself because I should have known that one this sheer (as shown on the mannequin) would most likely be polyester.  But at least I'm not out big bucks.