Paratex Dry is a 100% waterproof fabric (hydrophilic polyurethane coating) with a hydrostatic head in excess of 5000mm (items with a hydro static head in excess of 1500mm are generally considered waterproof). Closely constructed fabric with a ripstop construction. Teamed with a Hydrophillic Polyurathane (PU) which transfers water vapour chemically from the inside to the outside (due to the temperature differential between the inside of the product and out).