3M SF201 SecureFit spectacles are precision engineered protective safety eyewear featuring innovative 3M Pressure Diffusion Temple Technology. The flexible temple area of the spectacle diffuses pressure to enhance comfort while not compromising the security of fit across different facial profiles. How does the technology work? The temple area of the frame incorporates flexible ribs that are slightly offset from each other. When the frame bends, the ribs flex in different directions to diffuse the pressure throughout the temple area.