Polyester mousepads hold up better in direct sunlight than nylon.

No. Even a thin polyester top layer will outlast nylon under UV exposure. Polyester is inherently more UV-resistant — its molecular structure handles sunlight better. Nylon breaks down faster, gets brittle, and fades noticeably sooner. I’ve seen nylon mousepads turn yellow and crack in a few months on a sunny desk. Polyester ones just keep working. If your desk faces a window, skip nylon entirely.