PREMIUM MATERIAL: Composed of a breathable mesh back panel and 75% polyester 25% spandex, the running vest is lightweight, flexible, comfortable, durable. It's perfect for trail traini

• PREMIUM MATERIAL: Composed of a breathable mesh back panel and 75% polyester and 25% spandex, the running vest is lightweight, flexible, comfortable, and durable. It's perfect for trail running training and racing, road running, and marathons. • ADJUSTABLE AND REFLECTIVE: The lightweight backpack vest features adjustable hip belt and shoulder straps that can be modified to fit you perfectly. The running hydration vest also sports reflective printing that is highly visible. • AMPLE STORAGE: The running vest offers multiple pockets and pouches that can comfortably store items such as cell phone, keys, thin raincoat, water bottle, hydration flask, hydration bladder, and other items for outdoor activities. • VERSATILE DESIGN: Designed specifically for road cycling, running, hiking, and more, this hydration vest pack offers a compact structure and small size, ensuring a light and stable carry with minimal wind resistance. • INCLUDED HYDRATION BLADDER: This Running Vest comes with a 1.5-liter hydration bladder crafted from BPA-free materials, which is ample to satisfy the hydration needs during outdoor activities.