rain foam filter,polyurethane foam material Porous and Pliable,mildew protection Reticulated,flexible.good filter debris rain foam filter made by polyurethane foam, precisely cut to fit into 4'', 5" or 6", "K" style gutters.gutter filter keep small debris like leaf, pine needles out of your gutters as they maximize water flow into the gutters.gutter filter can adsorb the noise from rain .While ...