aa2.hair.v1 mods are often and lack physics. If you want better quality, look for:
The ".v1" might indicate a version of an asset or library. Check if there's documentation or a changelog that comes with it. aa2.hair.v1
: Stands for Artificial Academy 2 , a cult-classic 2D/3D hybrid social simulation game developed by Illusion. The game was celebrated for its distinct art style and varied hair options. aa2.hair.v1