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. Born in Austin, Texas Bounce-free Expandable, secure, low-profile pocket Comfortable, soft elastic prevents chafing Sturdy buckle and glides for even the most active users Pocket expands to 9" x 4" x 2" Fits waist size 25" through 38". Need a few more inches added to the waistband? Get our Belt Extender PRO. 1.5" wide elastic IMPORTANT: This product is not waterproof. Items may be exposed to moisture. We recommend the use of a waterproof aLOKSAKA(R) re-sealable bag if using with electronics or other small personal items that must remain dry. We suggest turning off electronics to prevent internal heat and moisture build-up.