I don't like the fireline in the winter. It has a bit too much memory and having loose coils in your line will make it very difficult to pick up light bites. It also seems to pick up water and freeze "water beads" quicker than your typical mono. For my ice fishing I tend to use all Berkley
Micro Ice in 2-4 lb test. That may seem light, but remember that these fish will take their time to ...