Defi The Elements Unisex Running Vest is a highly adjustable, one-size-fits-all phone holder designed for both men and women. Featuring a chest pocket that securely fits plus-sized phones like the iPhone Pro Max, this vest includes an elastic waist belt and zipped shoulder pockets for keys, energy gels, or AirPods. Built for comfort and convenience, it’s made with premium zippers and buckles—perfect for runners who want easy access to essentials without sacrificing performance. best running vest phone holder