Clam Pro Tackle knows ice fishing...the Frost Ice Monofilament Line is designed specifically for the rigors of ice fishing by Sunline. 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 a strong hook set with great bite detection while offering forgiveness for head shakes below the hole.