R90(Plastic titanium) material proportion is 1.0(lighter than plastic frames 20%) lightweight memory fucntion good elastic not easy to deform high temperature resistant suitable for long time wear. VO multi-layer deposition of mercury piece(also named REVO) using the U.S. space agency NASA invention of high vacuum ion plating technology on lens surface plating layer 9 mercury effective filtering ultraviolet (UV) light reduce glare and blu-ray enhanced heat insulation effect make the light relative to effectively achieve the retina increase the discrimination ability of the object suitable for water sports alpine environment limit and used in harsh environments such as desert campaign