Extremely visible -- I wear it when trail-running during hunting season, and it, together with my bear bell and orange ski cap, make me somewhat confident that I won't get shot by hunters (unless someone is hunting for humans). After I'd used it, I liked it well enough to order a second. One caveat: Although the material is synthetic, it's thick and stiff, like a thick cotton shirt, so you might not want to wear it in warm weather. It's great for Autumn hunting season in the Adirondacks.
Rating: [5 of 5 Stars!]