Clam Pro Tackle knows ice fishing...the Frost Ice Monofilament Line is designed by Sunline Co. specifically for the rigors of ice fishing. Frost ice line is Japanese-made to the strictest of tolerances, using the highest quality raw materials available. With a straighter “off-the-spool” feed, Frost line has less coil. And a moderate amount of line stretch offers a perfect balance of strong hook sets with excellent bite detection while offering forgiveness for head shakes below the hole.