Do you remember your dad using a shaving brush with a cup and soap?  I do and I was never quite sure why he used a shaving brush.  I have devoted the past 12 years of my cosmetology career to men’s grooming and I continue to learn every day about this niche market.  I have recently learned about the use and need for shaving brushes.  I found a great explanation of the history, brush quality, and need for shave brushes on Wikipedia.  here’s the link: 
http://en.wikipedia.org/wiki/Shave_brush
According to Wikipedia…”The greatest benefit from shave brush use is the tendency to soften and lift facial hair before a shave. Applying shaving cream by hand mats hair or raises it unevenly. Shave brush use, however, requires agitation of the soap or cream in a mug to form a lather suitable for a shave, before application of the lather to the face in a gentle circular motion. Therefore, a razor does not need to be pressed to the skin in order to provide a close shave…”  Wikipedia also explains that the more bristles on the brush the more water the brush holds, which leads to a richer lather consistency.  The thicker the lather will create less drag from the razor over the skin and this will lead to less irritation.
I’ve purchased many shaving brushes for our guests to buy over the years at metro FOR MEN.  Having researched this topic, I now feel more equipped to explain the features and benefits to our guests, as well as make better purchases of badger brushes in the future.