"The hair of the Prophet [SAW] was wavy, neither curly nor straight, and (hung down) between his ears and his shoulders." (Using translation from Nasāʾī 5053)
عَنْ شَعْرِ النَّبِيِّ ﷺ قَالَ كَانَ شَعْرُهُ رَجِلًا لَيْسَ بِالْجَعْدِ وَلَا بِالسَّبْطِ كَانَ بَيْنَ أُذُنَيْهِ وَعَاتِقِهِ