CertainTeed’s Landmark® ClimateFlex® UL 2218 Class 4 Impact Resistant shingles combines the beauty and dimensionality of wood shake roofing with the durable performance of polymer-modified asphalt. This results in a high-quality designer shingle that offers enhanced resistance to damaging hail, superior surface granule adhesion, and all-weather performance to protect a home year-round in any climate. The rubberizing aspects of ClimateFlex technology also provides cold-weather-friendly pliability, allowing contractors to handle and install Landmark ClimateFlex in low temperatures that make standard shingles stiff and brittle.