Junior’s Short Sleeve Jersey Our junior’s race jersey fits snugly and is made from RECYCLED fibers. Vertex is a woven, recycled fiber with more stretch than other woven fabrics! And, it has a high UPF rating. Think of UPF as SPF for fabrics – i.e. Great sun protection! Full zip durable YKK for best quality and endless zipping. Side Panels add to the anatomic feel. 2 back pockets with double tacked elastic keep your snacks in.