Fatwood is an earth friendly and natural way to get your fire started, and will eliminate clutter on your hearth as well. The sap in fatwood is a very flammable resin and can often be lit with a single match. Because of the flammability of the pine resin, fatwood is prized for use as kindling in starting fires. It lights quickly even when wet, is very wind resistant, and burns hot enough to light larger pieces of wood.