From the campaign:
"Our maps are printed on 100% cotton canvas, using a giclee process that injects museum-quality inks right into the fabric. The colors are bright and lively, and a light polymer coating allows them to be wet-erase safe - as well as cola/gatorade/pizza safe. They're light and portable, but resilient enough to last a lifetime. Your grandkids can play with these maps someday! Each one can be used on its own in a wide variety of adventures, or combine them into one large map that allows players to prowl the town looking for whatever sort of troublesome traps you've set."