⋆ Restrokes (going over the same area with the blade) is a common occurrence when shaving. Remember those average 170 strokes? Almost 120 of those are re-strokes. This is why many razors have "lubricating strips" at the top of the razor, to help make that inevitable second pass more comfortable.
⋆ Those multi-blade razors are why we don't get heavy 5 o'clock shadow like our grandfather's used to get. It's a process that's called "hysteresis" (see below). It works like this: When one blade touches the hair, it lifts the hair up from the follicle before cutting it. A second, third and fourth blade are positioned so that they are able to cut the lifted hair before it pulls back below the skin's surface.
How the process of hysteresis works, cutting the hair below the skin's surface.
⋆ Most disposable razors have a center mounted handle. This transfers all of that downward pressure directly to the blades, increasing the likelihood of shaving cuts and nicks. But a front-mounted, pivoting handle moves the load away from the blades and onto the edge of the razor (often a rubber fin that helps stretch and smooth out the skin).
⋆ Two out of three men say they have sensitive skin and get irritation when they shave. Much of this is because of pressure to the skin and curly, textured hairs growing into the skin (causing razor bumps and ingrown hairs). The SkinGuard was engineered to be like an airbag for your skin. A small comb is located between the two blades. It smoothes the skin between the two swipes of blades and raises the cutting edge just enough to cut the hair at skin level and alleviate any unnecessary pressure.