u/Scarecrow-of-Wilson

I'm looking to start a small, local, DIY upholsterer's supply company. The Foam supplier I'm speaking with has said that I can order foam of any length/width (thickness is always an option, so not worth mentioning here). This is intended for indoor use. Is there a better/best length/width that I should be ordering, or is something like a 60 inch, 72 inch, 80 inch sheet the better way to go?