Some customers have been troubled by what size armband to buy, please be sure to measure your arm circumference before buying, so that you can choose the right size and reduce the inconvenience caused by the size. Thank you for your cooperation. </br></br>Features:</br></br>The sports running armband is a product that fits under 6.5 inches phone,the storage space is large enough to fit into 6.5"screen cell-phone(up to 6.5-inch).It's a bit tight for bigger cell-phone though it's made of elastic material,we advise you not to put in your cell phone with a phone case and wired headphone.The supplier told us that the oversized mobile phone could expose outside a part of it if you want to listen to music through headphones, as shown in the picture.(at this point if you have a bluetooth headset, it won't be a problem,your phone can also be completely wrapped in it) </br></br>Machine washable</br>Easy to fit on your arm</br>Keep your phone case on</br>Easy access earphone ports</br>Comfortable and lightweight</br>Easy to carry keys/cash/cards/earphone/pen and more</br></br>Compatible Phone Models:(up to 6-inch)</br></br>iPhone X, 8 plus, 8, 7 plus, 7, SE, 6s plus, 6s, 6 plus, 6, 5S, 5C, 5, 4S</br>Samsung Galaxy S9/S8/S7/S8 Plus/S7 Edge,S6/S6 Edge/S5,Note 5/Note4, J3,J7/J7 Prime 2</br>Huawei Mate 9/Mate 8/P10/P9/Honor 7x/6C Pro/Mate 10 Lite</br>Moto G4/Moto Z/Z Play/Z Force</br>LG G6/LG G5/LG V30/LG X Power</br>HTC U11/One M8/One M9/One X</br></br>Note:</br></br>Suitable for most arms,in order to fit your arms better and don't need to readjust or worry about slipping during physical activity,please measure your circumference of bicep to find out which size is best for you. </br></br>Arm size</br>Small: 18-25 cm / 7.10"-9.84", </br>Medium: 25-30 cm / 9.84"-11.8", </br>Large: 30-37 cm / 11.8"-14.6".</br></br>We recommend that if you are between sizes to choose larger size for a comfortable and fashion fit.</br></br>