Can you give detailed steps? Did you wash and air dry? Did you wash and blow your hair out? Do you have to flat iron first or ca your roll from a blow dried state?I mostly use my Carusos on hair that has already been straightened (either flat ironed or roller wrapped). Typically I use them on hair that's not freshly washed (maybe 2-3 days after wash day...).
My blow-dried hair is not very straight, I'm sure it is possible to use them but I'm not a fan of hair THAT big!
My best advice would be to play with them on YOUR hair and determine the look that you like the best!
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