Fitletic Waterproof Armband, S/M Black WATERPROOF: Rainproof and splash proof armband (should not be immersed). TRUE TOUCH WINDOW: Easily use your smartphone without removing it. FITS MOST PHONES: Arm band fits iPhone 8 and Galaxy S8 and similar sized phones. CONVENIENT: Exterior pocket with Velcro closure protects small valuables. ADJUSTABLE: S/M fits 9-12 arm circumference, L/XL fits 11-15.5 arm circumference.