For a perfect fit that sits perfectly and comfortably on your lower back, the Nathan Triangle Belt delivers seamless wear for walkers, joggers, and runners. Air mesh backing facilitates air flow to help keep you cool and dry. The sleek design and 70/30 bottle position won't leave you with a heavy, bulky feeling at your waist and offers more stability and comfort. Fully, adjustable nylon belt. Easy-squeeze 22 oz./650 ml Tru-Flex bottle with reinforced, leak-proof, soft-sip Push-Pull cap. Gusseted mesh pocket fits smart phones, keys, and other personal items.