Introducing FT Synthetics HYDRA, a breathable (30 Perms) synthetic roofing underlayment designed to add an extra layer of protection from water penetrating your roof and at the same time help the release of trapped moisture due to poor attic ventilation. HYDRA is high strength, light weight, durable for up to 6 months UV exposure and has a lifetime limited warranty. HYDRA includes our slip resistant GRIPSPOT™ technology top surface for superior walkability during installation. HYDRA is a 100% recyclable product