Sordin Arc Rail Adapters (SARA) were derived out of a need to directly attach MSA Sordin's directly to an end user's helmet. Rather than reinventing the wheel, the SARA calls on the spring tension generated by the Unity MARK rail adapters (sold separately) to achieve proper seal around the users ears and seamlessly integrate into the user's head borne system. Lightweight, streamlined and designed with the simplicity and strength demanded by the end user, the SARA eliminates the headaches and discomfort associated with wearing over the ear head-band ear pro inside the helmet. Designed for use with Behind the Head Headsets