Heat Resistant Protective Liner (39×47in)This heat resistant liner is made from a heavy duty fiberglass material with a unique silicone coating that can withstand extreme temperatures up to 1800°F. Our heat resistant pads also feature delicate stitching, non-stick edges and anti-tear edges. (Note: Use with the black side up). Oversized Dimensions Not only does it form a solid barrier under the fireplace, capturing potential splashes of liquids and sparks, but it also becomes an indispensable layer of protection when barbecuing, ensuring that your patio, yard and lawn remain free of smoke, spicy sauces and charcoal disturbances. High Quality Fiberglass Material Our fire pit underlay is made of high quality silicone coating and fiberglass, featuring strong heat resistance and corrosion resistance. The heat-resistant underlay shows outstanding performance in heat resistance and corrosion resistance, while not burning, melting, molding or fading. You can buy with confidence. Easy to Clean