Be Seen. Be Safe. MDI has a range of high-visibility safety vests to make utility, construction, survey and other roadway workers very conspicuous while they’re on the job. Our brightly colored fluorescent orange vests, lime-green vests and The Red Vests, with their brilliant reflective bands, stand out in daylight or headlights. Most MDI safety vests are ANSI Class 2, ANSI Class 3 compliant and come in a durable mesh or solid polyester material.