Mitchell’s Wool Fat Soap Shaving Refill puck. As featured on many shaving forum websites, this is the original formula. Mitchell’s Wool Fat shaving soap from Bradford, Yorkshire. Produces a smooth lather with a wonderful fragrance. Mitchell’s Wool Fat Soap was first produced in the early 1930’s by Bradford chemist Fred Mitchell who realized that the natural lanolin content of wool fat, which kept the hands of local sheep shearers and wool sorters so exceptionally soft, could also be beneficial to delicate complexions and sensitive skins. A simple and natural product, Mitchell’s Wool Fat Soap is still made to Mr. Mitchell’s original formula, based on a recipe from the turn of the century and incorporating lanolin from the wool fat as the key ingredient. This gentle and soothing shaving soap is especially suitable for sensitive skin. Natural lanolin from sheep’s wool keeps the skin soft.