Traditional Synthetic Polyhemp Washing Line Synthetic Polyhemp washing line rope has the look and feel of natural hemp. Synthetic polyhemp, also know as Hempex is weatherproof, meaning it will not shrink when wet. Synthetic Polyhemp is: Weatherproof Rot-proof Does not shrink RopeServices UK would always recommend using a synthetic rope outdoors as they are waterproof and rot-proof unlike natural ropes like natural cotton.
