【 PRODUCT MATERIALS】: Nylon/Polyester fabric running iphone holder for moisture wicking, quick drying, stretchable, and great softness against your skin. The material is lightweight so you almost cannot feel it when you put it on. 【FIT FOR DIFFERENT WAIST SIZES】: Fits 25.9 - 42 inches waists with fully adjustable elastic strap phone workout holder. Strong adjustable elastic waistband ensures it bounce free. Dimension size: 4.90"x 10.00" (HxL) 【SMART PHONES FIT】: iphone workout holder for most of smartphones including Apple iPhone X XS 8 7 SE 6 6+; Samsung Galaxy Note Series & Samsung Galaxy Series; SONY, LG, or any other smart phone compatible. 【HOLD MORE BELONGINGS】: Any sizes of smartphones, passport, keys, credit cards, money, energy gels. Ear bud hole is for pleasant music in running. It can also be used as fanny pack greatly for all forms of exercise including walking, running, hiking, riding bikes, working out at the gym and more. 【WATER RESISTANT】(sweat-proof and rain-proof): Keep your valuables dry while you are doing exercise (not fully waterproof), not exposure to a lot of water or rain for long time. Great value for triathlons, marathons