A fibrous bristle load holds significant amounts of water, creating a rich lather. This translates to less razor skipping and dragging, providing a smoother shave. Bringing a shave brush across your skin produces a mild exfoliation, often replacing the pre-shave routine. Thicker and more emollient lather is achieved with a brush that holds a lot of water. Using a shave brush helps to prepare your skin for a comfortable shave.