NXE ActiveSLEEVE X-Large Armband for iPhone, iPod, and all Smartphone/cell phone/MP3 players, 2 Pack (Black/White) Universal Sport Arm Sleeve For Smartphones Athletically Inspired & Designed For Athletes Allows Freedom Of Movement & Unobstructed Use In A Limitless Variety Of Athletic Activities Lightweight & Breathable Device Stays Safe From Perspiration Allows free movement while providing ample protection of your device High-end, breathable material stretches to fit any size/shape arm with extreme comfort Simple Velcro closure with textured grip tab allows quick access to device, as well as blind access when worn under clothing In the package: 1 White Sleeve 1 Black Sleeve SLEEVE SIZE): (BICEP CIRCUMFERENCE IN INCHES) S: 7"-10", M: 9"-13", L: 11"-16", XL: 15"-18"