How do I flatten a curled mousepad?

Lay the mousepad flat on a hard surface, put a heavy book or two on the curled edge, and leave it overnight. If it’s still curled after 24 hours, use a hair dryer on low heat over the curled edge for 20-30 seconds, then weigh it down again as it cools. You might have to repeat this a couple times if the pad was rolled tight for months.