A swivi buckletm auto adjusts the belt for a customized fit while the large storage pouch has room for your running essentials and large smartphones like the iphone 6 plus features four 10 oz 300 ml flasks with push pull caps ergo shaped soft monofilament belt offers multi directional stretch that eliminates bounce large zip pocket with key ring clip and front stash pouch for running essentials fits up to iphone 6 plus