Jami` at-Tirmidhi 1724

Narrated Al-Bara' : "I have not seen anyone with hair past his shoulders in a red Hullah more handsome than the Messenger of Allah (ﷺ). He had hair that would flow on his shoulders, (and he had) broad shoulders (and he was) not too short and not too long." [Abu 'Eisa said:] There are narrations on this topic from Jabir bin Samurah, Abu Rimthah, and Abu Juhaifah. This Hadith is Hasan Sahih