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I don't really know anything about surface tension, water penetration and face lubrication but to tell the truth I don't think I need to know. as long as I know I get a better shave thats enough...

when I saw shea butter mentioned I had to chime in. I use suave skin therapy moistureizer with coco butter (I might try the one with shea butter when this bottle runs out) which I put on pre shower...