The present invention relates to a process for straightening and frizz reduction of hair which leaves hair in one part straight and volumeless and the remaining part may still have the curly appearance but not frizzy at all. It has been found out when treating hair at the parts where the straight appearance is preferred with a composition comprising higher concentration of hair straightening ingredient and straightening the said part with an iron at relatively higher temperature and treating the remaining parts with a composition comprising the same straightening ingredient at a lower concentration and treating the said parts with an iron at relatively lower temperature provides hair structures which appear to be straight and with low volume in one part which is the part closer to the scalp and, curly and voluminous but not frizzy at the remaining parts which is usually the lengths.
