I measured my pony tail thickness back in September and it was 2.5". I measured again today and it was 4" ! I made sure I measured the same way I did last time, and the measurment is correct. I have definatly changed the way I take care of my hair since I found this site in September. I c/o most of the time, and other times I use LUSH shampoo bars. I also oil and SMT. Any thoughts?