Check the listing for details. Running Vest for Women Men, Adjustable Hydration Vest Running with Water Bladder. Color: Black, Condition: New. Listed at 57.80 USD. 1. The running hydration vest comes with a 500ml water bladder, which is BPA and odor free. Its easy bite valve design effectively prevents water spills from the bottle, just push down the mouthpiece and bite the spout to replenish water to meet the needs of long-duration exercise. 2. This running vest is made of soft and sweat-proof neoprene material.The ventilated mesh cover keeps your back cool by maintaining air circulation, preventing discomfort due to accumulated heat, and providing excellent air circulation and breathability. Weighing only 300g, it won't slow you down. 3. The package includes LED Reflective Belt and Outdoor Headlight.It is bright at night and has high visibility to protect your safety, even in the harsh environment of 1000 feet away.