In addition to reflective strips, it also has bright LEDs in the back and front, so your safety doesn't depend on being directly lit by approaching headlights.
Made of thin mesh and weighing only 3 oz, it won't restrict movement, and has convenient cinch straps so you can quickly adjust the fit if you add or shed layers. The zippered pocket in the back has a water-resistant section that fits a wallet or cell phone.
Available in two sizes, it is machine washable and comes with two long-life button-cell batteries. A real improvement over typical safety vests.