LOVE THIS!  So reviews say it helps with knotted hair and skin and frizz.  I tried these just to see. I have straight hair but found that I have a significantly lower number of tangles in the morning. My daughter has wavy (think frizzy) type hair and hers is incredibly smoother, fewer tangles and noticeable less frizz. She even says that it is much easier to brush her hair now. Never going back to cotton pillows.