US Patent 10034511 Athletic helmet with magnetic system

An athletic helmet includes an outer shell, having an outer surface and an inner surface, shaped to receive a head, and a magnetic system disposed adjacent to the inner surface. The magnetic system has at least one magnet configured to have one pole aligned such that its magnetic dipole moment is oriented approximately normal to the outer surface and a magnetic holding device configured to allow the at least one magnet to slidably move along a surface of the magnetic holding device.