This type of electric razor has oscillating blades hidden behind thin, perforated steel foils. The foils lift your facial hair (or any hair, really) up to the blades for a close shave. Most of the foil shavers we evaluate have between three to five blades. The number of blades determines the size of the shaving head and, in theory, the speed of your shave. However, bigger isn't always better. If a foil razor's shaving head gets too big, it can be hard to maneuver over the contours of a smaller face and neck. Rotary shavers
Rotary razors use spinning circular blades, which flex in their housing to accommodate the contours of your face. Because each blade on a rotary shaver swivels independently, these shavers may do a better job than foil shavers at following the contours of your face and neck. Rotary shavers tend to be quieter than foil shavers, handle longer hairs better, and offer the advantage of letting you shave in almost any direction -- up and down, side to side, or even moving the shaver in circles.Wet/Dry Shavers
While most rotary razors can work either wet or dry, if a wet shave is a priority, wet/dry foil shavers get high marks. Many users comment favorably on the smooth shave they get from grooming during or just after a shower, and those with sensitive skin usually benefit from using a shaving lotion or cream. The versatility of a good wet/dry foil shaver means you can fine-tune the shaving experience to suit your skin and hair type, or to how much time you have for grooming on any particular day.Battery Powered Shavers
Most modern electric shavers have a built-in rechargeable battery, but for travel -- especially to locations where the electric service differs from the U.S. -- a shaver powered by standard, AA replaceable batteries is worth considering. Performance is typically a notch (or more) poorer than standard electric razors, but these cost less and are lighter in weight, making them good for toting around on globetrotting adventures, or to toss in a briefcase for touch ups during the day. Both foil and rotary versions are available.