An integrally extruded all plastic "pile" weatherstrip comprises an elongated longitudinal substrate from which vertically project a plurality of integral, spaced parallel, thin, flexible, deformable, wavy S-configured fin members. The exposed upper ends of all or any desired lesser number of the fin elements may be partially slit to from 20% to 100% of the fin height to control the amount of air and water moisture infiltration through the weatherstrip. The fin element ends are slit at a desired bias angle with respect to a horizontal line lying within a horizontal plane surface in which the fin ends are located. The extrudable plastic is preferably high density polyethylene, polypropylene or polyvinyl chloride and may optionally contain an ultra-violet absorbent composition and a partially compatible lubricant. The wavy fin weatherstrip assembly may be manufactured by unbalancing an extrusion die so that the rate of plastic flow through the fin forming orifices is substantially greater than that occurring at the base or substrate forming orifice. Alternatively, the extrusion die can be built in sections and by oscillating the fin orifice section relative to a fixed base orifice section, or vice versa, the wavy fin configuration is extruded.
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