Helmets comprising additively-manufactured components

A helmet comprising:

• an outer shell including a first shell member and a second shell member movable relative to one another to adjust the helmet to fit a wearer's head when the helmet is worn;
• and
• an impact absorbing inner liner disposed within the outer shell, the impact absorbing inner liner including a first liner portion disposed within the first shell member and a second liner portion disposed within the second shell member, wherein the first liner portion and the second liner portion each define a separate padding forming parts of the impact absorbing inner liner, the first and second liner portions being movable relative to one another when the first and second shell members are moved relative to one another;
• wherein at least one of the first liner portion and the second liner portion comprises a three-dimensional lattice structure formed of a plurality of unit cells and a liner skin integrally formed with the three-dimensional lattice structure, the liner skin defining part of a head facing surface of the impact absorbing inner liner, the liner skin adapted to contact a wearer's head when the helmet is worn, the liner skin comprising:
• at least one solid skin along the head facing surface of the impact absorbing inner liner;
• and
• at least one open lattice skin along the head-facing surface of the impact absorbing inner liner to define at least one exposed region of the three-dimensional lattice structure free of the solid skin.