An outsole for footwear is able to be manufactured by co-extruding two types of blends of the same plastic material, wherein first strips of plastic material having a light color, or the color of teak wood, are placed side-by-side and alternated with respective second strips (6a and 6b) of plastic material having a dark color, or the black color of the seam used to seal the decks of yachts, wherein the width of said first strips is significantly greater than that of the second strips. Said outsole is configured to reproduce the visual and tactile effect of the teak bridges and decks of yachts with teak strips interspersed with black seams; wherein the colors of the first and second strips are mutually exchangeable.