The best-selling, fully-adjustable, bounce-free, two-flask hydration belt on the market. Perfect for a bounce-free long run, the Nathan Trail Mix Plus Belt carries 20 oz of fluid between dual 10 oz Super-Flex flasks and offers enough storage for your iPhone 6. Molded SpeedFit holsters secure the flasks to the belt with a limited stretch elastic to resist bouncing and adjusts to fit most waists. A center zipper pocket securely holds your keys, nutrition, or your iPhone 6. Breathable air mesh backing makes for a comfortable fit while reflective trimming offers visibility in low light conditions.