Adjustable running vest, ultralight and durable, suitable for trail running, cycling, hiking, mountaineering, marathons, and other sports. This cycling hydration vest features reflective strips, is lightweight, and breathable. Durable: The hydration vest is made of water-repellent fabric that causes water droplets to bead up and roll off. Its honeycomb-patterned breathable mesh design ensures full body ventilation, while the soft, skin-friendly material remains lightweight, making it suitable for various outdoor activities and built to last. Safety: Reflective strips on the front and back of the vest, as well as along the zippers of the matching running belt, provide double safety in low light, allowing athletes to train safely at night or in poorly lit environments. Adjustable: The dual buckle design and ergonomically adjustable waist belt ensure a snug fit that prevents bouncing, providing comfort whether you're exercising or exploring nature. Practical running belt: The included running belt accommodates a 7.5-inch smartphone, features three separate zippered pockets and a headphone port, and each zipper is equipped with reflective strips to ensure safe use in low light. Ample storage space: This unisex running vest has a dedicated water bottle pocket (fits 500 ml soft flasks), a phone pocket that holds phones up to 7 inches, and a large zippered back pocket for storing clothes, snacks, and other essentials.