A little extra insulation goes a long way with the Clam® Refuge Ice ThermalTM FLR Floor. It creates an added layer of insulation to retain heat, and creates a barrier between the ice and your feet. And it's easy to install, too. Simply connect it at each corner and secure it in place with the hook-and-loop fasteners along the edges. But what about access to the ice, you ask? 4 openings give you plenty of options for drilling holes to get to the gold.