The Unity Cold Weather Liner (CWL) is designed to install in any helmet with Velcro pads. By integrating directly into the helmet, the CWL creates a barrier against the elements with micro fiber fleece that keeps the wearer’s head warm. The material thickness creates minimal or no displacement of pads that can cause the helmet to not ride properly, as is the case while wearing a standard beanie under the shell. This ensures correct shell coverage of the head, alignment of night vision goggles, and fitting of communications gear. Operator comfort is increased exponentially by providing more coverage to exposed areas under the helmet shell with dual layer fleece while the same pads that normally contact the head will continue to do so with the CWL installed.