FOIL SHAVERS: These are characterized by straight heads that use oscillating blades. Blades for these shavers are beneath the foil – so blades don’t get direct contact with the skin thus reduce chances of getting nicks and cuts when shaving. A foil is a thin layer of metal – with holes that form a mesh pattern. Now when the shavers head goes over your beard, the foil lifts the hairs from the skin and exposes them to the cutters beneath the foil. This explains why you will never get 100% close shave with foil electric shavers. But they are the best shavers for sensitive skins.