PermaFelt Gold is a nail down premium synthetic roofing felt that delivers exceptional weather barrier performance compared to traditional asphalt products and other synthetic underlayments. PermaFelt Gold is 100% synthetic felt, coated on both sides with a proprietary rubberized, polyolefin, slip-resistant coating. The top side has an unsurpassed level of grip with added embossment from new True Trac technology. It can be easily bent for forming around corners, valleys, and ridges. Can be exposed to the weather up to 6 months.