What do a.m. and p.m. stand for?

helmet liner

a soft or padded lining for a helmet.
Military. a stiff, plastic head covering designed to be worn alone or under a steel helmet for protection. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for helmet liner
  • After a curtain call, he tossed his helmet liner into the stands.
  • During a second sweep more towards the outside of the cover, a helmet liner was found and then the two bodies.
  • Wear or carry a thermal headband or helmet liner for extra warmth.
  • May include a helmet liner to insulate against cold.

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