It is sunnat for men to have curly hair. Because , the general habit of Rasulullah (SAW) was to keep Babri hair. It can be done in three ways. One. Along both shoulders. Two. In the middle of the neck. Three. Up to both earlobes. (Sunan Abu Dawood , Hadith No. 4173-418) Rasulullah (peace be upon him) used to shave his head to be halal from Ihram. Besides, he never shaved his head. At this time, he has given priority to shaving his head and keeping his hair short. That is why Imam Tahtabi (Rah :) said , shaving the head is also Sunnah. And it is forbidden to shave some parts and leave some. Hair can be kept short if you do not want to shave. Scholars say that it is sunnat to keep Babri in three ways and it is permissible to keep the hair of the head short or shaved. Also do not consider it permissible to keep the front or back long or to keep it small or large on the right or left side . The remarkable thing in this case is that the cutting of the hair which will be in imitation of a different race entity, will therefore be included in the illegitimate. (Mahmudia - 26/460 , Mishkat - 361 , 232 , 360 ) It is forbidden for girls to shave or cut their hair like boys. Again, it should not be so large that it is difficult to reach the water during bathing. It is better to keep it up to the back or waist. It will be permissible to cut the lower part of the waist in the sem. Of course, there is no problem even if it is not cut. (Tirmizi Sharif 1/162 , Muslim Sharif 1/146