Here’s a simple foot friendly outdoor sauna foot mat. I especially like standing barefoot on this cedar slat mat in winter time. The snow, ice, and cold water seep into the ground and my feet stay fairly dry. Nicer than plastic. Just rip some slats from a cedar board or maybe purchase some 1×1 or 2×2 cedar boards from a lumber yard, attach a couple cross supports underneath with a finish nailer, et voila.