Here's what I do:
1. I bind the main trunks of the fig trees together with twine so they resemble a folded umbrella, but not so tightly that it damages the sensitive bark of the tree.
2. Using a sledgehammer, I drive three metal posts into the ground around each tree, 2 to 3 feet from the center of the bunched-up trunks, and pound them in firmly to withstand winter winds.
3. For the first layer of insulation, I bind handfuls of straw or hay to the trunks with twine.
4. Next, I cut off a section of chicken wire fence (8 to 10 feet long), wrap it around the metal posts and tie the ends together with twine.
5. I then dump fallen leaves from my yard into the chicken-wire enclosure and tamp them down with the flat end of an iron rake.
6. When the leaves reach the top of the enclosure, I cap the tip of the trees with a plastic pail lined with straw, and then drape the whole thing with plastic and secure it with twine.
7. Finally, I wrap a layer of roofing paper around the outside base of the structure, and secure it with more twine. And I wrap the entire structure with burlap, again tying it down with twine. (The burlap adds some insulation and looks better than the plastic and roofing paper.)