Built for comfort and durability. Like our popular Performance Series, the Performance Pro has a weather-resistant zipper and pocket that will help keep essentials safe from the elements or a sweaty run. The spacious pocket will hold any phone on the market and has four gel loops on the elastic band to hold your energy gels. Great for strenuous activities like trail running, marathons, or adventure races. The elastic on this belt is 1.5" wide, 50% broader than the Original SPIbelt.