At BUMOVE, we sincerely feel that everyone deserves the best technology on their fitness journey. Whether you're a professional athlete or preparing for your next fitness endeavor - we want to create a relationship with you every step of the way. Our passion is to innovate the fitness industry with quality technology. This armband is made with a premium blend of Lycra and Neoprene, which are gentle on the skin, very durable to use. Show Details Water, Sweat Resistant Design The armband is made of stretch resistant neoprene which is water resistant and sweat resistant, and it is not deformed by pulling. Humanized Design Built-in Key & Card Pocket keep your keys, ID cards, credit cards and money or anything safe and dry. 3 Headphone jack holes provide easy access to plug earphones and charger. HD High Sensitive With the HD transparents PVC filter, your screen retains full functionality. The high sensitive nature allows you to listen to music, answer phone calls, text messages, track your fitness without taking your phone off to use the touchscreen. Q1: What material is this made of?A1: PVC water resistant material on the front screen and soft Lycra fabric on the back.Q2: Is there an opening for inserting headphones?A2: The armband has 3 headphone jacks for easy access to plug headphones and chargers.Q3: If I have a very skinny arm, how can I wear this armband?A3: You should fold the band first and use the strap on the reverse side to stick.Q4: Is this armband good enough for the phone with an otterbox case on?A4: Sure, this armband fits the phone well even with an otterbox case on.Q5: Is this size suitable for everyone? What is the measured value around the arm?A5: Yes! The normal size range is 17-40cm (6.7-15.7 inches). If an extension strap is used, the maximum size is 56cm (22 inches).