GutterFilter , polyurethane foam material Porous and Pliable, open cell GutterFilter, mildew protection

Gutter Filter made from exterior-grade ployurethane, Gutter Filter is precisely cut to fit into 4'', 5" or 6", "K" style gutters. While very porous and pliable, it is also highly resistant to physical stress and deterioration. It was formulated to withstand the harshest weather conditions. As in many synthetics today (e.g. carpets), "BioCide" is a permanent feature of the fiber. It stops the growth of mildew, moss and other fungi in your gutters.

Gutter Filter