worst hair ever [SEP] yes it is human hair but it is as brittle and rough as straw after the first wash and washing with high quality salon biolage even very disappointed unmanageable in addition two came out within days of installation have not used heat at all on them but it made zero difference tangles constantly because of uneven lengths throughout at first i thought they assembled the hair with no attention to cuticle direction now i think it is both that and the uneven lengths