Lens are made of thick polycarbonate, can prevent eyes from smoke, small particles etc.With a piece of transparent anti-fog lens, to replace the previous normal lens with a piece of transparent anti-fog lens, to replace the previous normal lensThe brim of the frame covered by polyethylene meterial which is pliable and comfortable.Buckles on the sides for adjustmentSuitable for outside activitiesThis enhanced OK goggles, a miniature fan device, mount after 5 batteries, strong gears can be adjusted and low-grade, won't make the fog effect when working action eyes, let your eyes in a comfortable state