I got some ultra-cheap soap from Walmart ($1.97), threw it in a coffee cup (fits perfect), got a ultra-cheap brush from Walmart ($5.00), pour some water on the soap in the cup, dump the cup out, swirl brush around until there is suds, apply to face and work it around with brush, then shave. I don't know but this works well for me, some people on here use $100 worth of soaps and other concoctions while shaving and that works for them. I like to keep things simply and people shaved with straights for years without all the fancy stuff we have now.