The Kilpi HARDROCK-U is a running vest that serves as a backpack for mountain and endurance runners. Its design and construction were designed in collaboration with Kilpi Racing team runners. The base is a soft, lined and perforated material that adapts perfectly to the body while running. It is also lightweight and breathable, so the person running in it hardly notices it on. The vest is put on like a standard vest and fastened with elasticated chest laces. The entire construction of the vest is super lightweight and is offered in several sizes, from smallest to largest. The vest offers several handy mesh pockets, for instance for gels, soft bottles or other materials. Zippered pockets for valuables are on the front and back. The vest also offers the possibility of attaching trekking poles with elastic loops. Of course, the Kilpi HARDROCK-U vest features reflective prints.