Shaving brushes have been used for centuries to help create a close and smooth shave. They are typically made from natural materials like badger hair, boar bristles, or horse hair. This makes them soft and gentle on the skin, while also providing enough friction to lift the hair follicles and help the shaving cream or soap to penetrate them. A good shaving brush will evenly distribute the cream or soap, and help to create a rich lather.