MRC:
Those unusual or unique characteristics or qualities of an item not covered in the other requirements and which are determined to be essential for identification.FEAT
Special Features:
Shatterpoof, scratch resistant plutonite polycarbonate lenses can be interchanged; polar ellipsoid lens shapes elimates distortion; hammerfang ear stems provide a 3 point fit to comfortably accomodate various head sizes; patented hydrophilic silicone earsocks and nosepieces become tacky when wet, so they won't slip down when you perspire
