Northeast Products Therm-A-SEAT Ice Fishing Hole Insulator/Cover COVERS AND INSULATES ice fishing holes; Keeps holes from freezing over EASY TO INSTALL; Simply set over hole and insert tip-up through slot (it floats) Works like magic to keep your ice hole clean; NO BATTERIES OR CHEMICALS NEEDED Features SOFTEK CLOSED-CELL FOAM INSULATION 12 inches in diameter and 0.75 inches thick to FIT OVER A STANDARD ICE AUGER HOLE