Hi Guys, When you calculate cloth OR hair it will create a temp file holding the information for the movement of the hair or cloth. When you SAVE the Poser .pz3 file it turns the temp file into a .dyn file. Every piece of cloth or hair that needs to be calculated gets a .dyn file. So... If you have 3 cloth simulators you will have 3 .dyn files. If you move the .pz3 file to another location you should move the .dyn files with it so you don't have to recalculate again the next time you open the file. Cheers, Joe