This skullcap is perfect! I have to wear a CPAP mask and chin strap at night and the straps have left indelible dents in my hair. So I put on this skullcap first, then the CPAP mask and chin strap. The problem is solved! The lid is very well made and even has a yellow weld block gasket (silicone I think) on the front edge. Although I don't sweat when I sleep, the silicone helps keep the cap in place. The label recommends wearing a yellow Sweat Block Seal cap centered on the forehead and 1/2 inch above the eyebrows. I wear mine raised a little so it just covers my hair. The hat is made of high quality, breathable fabric - the fabric content is 63% nylon, 23% polyester and 14% lycra. Labels say "hand wash cold, hang dry". Attached are photos of the front and back, a close-up of the yellow Sweat Block Seal and a close-up of the fabric. I'm thinking of buying another pair in the same different colors!
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