The Nathan Pinnacle 4L Hydration Race Vest Pack in black with hibiscus accents is a high-quality women's hydration pack designed for running. Made from a durable blend of 60% nylon and 40% polyester, this vest pack offers a generous 4L volume to keep you hydrated during your workouts. The Nathan brand is known for its superior quality and this model lives up to that reputation, making it a great choice for female runners looking to stay properly hydrated while on the go.