Abstract: A helmet is disclosed. The helmet comprises an outer shell defining a cavity to receive a head when worn. The outer shell includes a domed inner surface facing towards the cavity and an opposite outer surface. A liner is disposed in the cavity, the liner having a head facing surface and an outer surface opposite the head facing surface, the outer surface facing towards the domed inner surface of the outer shell. The liner comprises a three-dimensional lattice formed of a plurality of cells and at least one liner skin integrally formed with the three-dimensional lattice, the liner skin forming part of the head facing surface of the liner, the liner skin covering less than an entirety of the three-dimensional lattice so as to define a skinless surface area on the head facing surface of the liner.