Our running belt bag is made from skin-friendly Lycra and polyester fabric materials, soft, breathable, moisture wicking and sweat-proof. It is slim (0.06in thickness), lightweight (0.16lbs) but useful with its multi-functional pocket which can organize your items such as phone (within 6.0inches) and keys separately to avoid any unwanted friction and can allow you to enjoy music at any time through the convenient earphones hole. Additionally, it designs a special reflective strip surrounding the zipper to keep your running safe.