Alpha ProTech Techno SB25 Synthetic Roof Underlayment is a 100% synthetic woven roof underlayment offering high tear strength. Cool Gray spunbond non-woven walking surface offers up to 14% lower surface temperatures and AQUA TRAK technology for high traction in both wet and dry conditions. Slip resistant back surface for added installation safety. UV Resistant and can be left exposed for up to 6 months. 25 year warranty - guaranteed to shed water. Pre-printed nailing pattern and 3" overlap lines speeds installation. Suitable for use under all residential roof claddings, including steel and copper. Custom printing available.