SecureFit Protective Eyewear features pressure diffusion technology that naturally adjusts to individual head sizes for a custom, natural fit as soon as you put them on. The self-adjusting construction adapts to each wearer and provides a snug fit that keeps the glasses securely in place as the wearer looks up and down or side-to-side to eliminate the need for frequent repositioning. Universal design eliminates the expense of stocking multiple frame sizes at jobsites to accommodate different people to keep your costs to a minimum. Impact-resistant polycarbonate lenses absorb 99.9 percent UVA and UVB rays up to 380 nm to maintain healthy vision when used outdoors. Anti-fogging properties help maintain visibility in hot and humid environments to help increase usage on the job.SecureFit Protective Eyewear features pressure diffusion technology that naturally adjusts to individual head sizes for a custom, natural fit as soon as you put them on. The self-adjusting construction adapts to each wearer and provides a snug fit that keeps the glasses securely in place as the wearer looks up and down or side-to-side to eliminate the need for frequent repositioning. Universal design eliminates the expense of stocking multiple frame sizes at jobsites to accommodate different people to keep your costs to a minimum. Impact-resistant polycarbonate lenses absorb 99.9 percent UVA and UVB rays up to 380 nm to maintain healthy vision when used outdoors. Anti-fogging properties help maintain visibility in hot and humid environments to help increase usage on the job.