SecureFit 400 protective eyewear in a convenient 3 pack of multi shaded lenses. See a clear difference in comfort, safety and fit. 3M SecureFit Safety Eyewear uses patented 3M Pressure Diffusion Technology for a secure, comfortable fit. The lightweight, flat temple, low profile design works seamlessly with hearing protection for a difference you can see and feel. Part of the 3M Pro Series Safety Products line that was designed for the way pros think, the way they shop and the way they work.