Nite Ize LED Run VestThe Nite Ize LED Run Vest was designed with serious runners in mind. It is a comfortable, lightweight safety vest that features both passively reflective safety accents and bright active LED illumination so that you remain safe and are easily visible. The Nite Ize LED Run Vest is made of lightweight and water-resistant mesh that is flexible and easy to move around in. The two illuminated polymer strips can each be set to one of two bright LED modes (steady glow or flash) and the sides are trimmed with passively reflective safety accents. This way you will be safe and highly visible on your early morning, evening and nighttime runs. The Nite Ize LED Run Vest is the smart and affordable choice for runners of all kinds.Features: Comfortable, lightweight safety vest that features both bright, active LED illumination as well as passively reflective safety accents Comes in two sizes including Small/Medium and Large/Extra Large Bright Red LED illuminated stripes are located on the front and back of the best and can be turned on/off individually Back zipper pockets with both mesh and weather-resistant pocket options that easily keep your personal items secures and available during your run Back pockets include handy key clip Easily adjustable straps on both sides of the vest allow for precise fit for comfort while running Weather-resistant design and construction Easily replaceable batteries (2 x 2032 3V Lithium Batteries) Dimensions: Large/Extra Large: 20.8" x 13.6" x .01" Weight L/XL: 3.1 oz No longer available - Small/Medium: 18.2" x 12" x .01" No longer available - Weight S/M: 2.8 oz