HydroStop PremiumCoat Fabric is a tough, stitchbonded, non-woven, heat-set polyester designed for roofing and flashing applications of all types. It is used in conjunction with either the HydroStop PremiumCoat or HydroStop BarrierGuard Systems. HydroStop PremiumCoat Fabric acts as a reinforcing material for the long-term strength of either system. HydroStop® PremiumCoat® Fabric is a 100% polyester reinforcement for penetrations. It easily conforms around penetrations and improves strength while maintaining flexibility.