Schoeller® - Reflex
Taking retro-reflectivity to the next level, Schoeller’s Reflex technology incorporates a special complex weave with millions of microscopic glass beads that refract and reflect light back towards the original source light.  Because the microscopic glass particles absorb much less of the light than is absorbed by ordinary reflective materials, and because the particles focus the reflected light back at the light source, the Reflex patches on the Spirit jacket and pant are visible at up to 100 meters (300 feet) in dark or twilight situations.  The result is that you are much more visible in night or low light situations.