Asalamuilakum waRahmatullahi waBarakatu, I am writing in order to gain some knowledge and in any case achieve some clarification on the matter of putting "things" into one's hair. After becoming Muslim I stopped adding extensions that were advertised for hair from wool, silk, synthetic, horse hair, and human hair. What I have come to do now is adding yarn into my hair. I had thought it to be permissible because yarn is not hair, but something that is brought from the arts and crafts section in stores and advertised as material to knit or crochet with. I also thought that it was permissible as long as I did not use any yarn that was the color of my hair so there would be no assumption of it being my hair. The last reason I thought it to be permissible was for it being used to beautify one's self for their husband. So in plain... Is it permissible to add cotton yarn in my hair as long as it is not the color of my hair?I pray that Allah makes it easy for you to clarify this for me, and allow me to benefit from the knowledge.

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ʻalayhi wa sallam, is His slave and Messenger.

Firstly, we would like to congratulate you for embracing Islam. May Allaah increase your keenness to adhere to the straight path and observe the laws of the religion. We ask Him to bless you with guidance, piety and righteousness, to grant us and you a good end, and to remove us from sins and misdeeds.

As for your question about using hair extensions made of yarn, we have already answered it in Fatwa 217561 and underlined that there is no harm in using such hair extensions as long as they do not resemble human hair; so it is important that you refer to that Fatwa.

Allaah Knows best.