Fitletic Adjustable Armband - Pace FITS MOST PHONES: Fits iPhone 8 and Galaxy S8, and similar sized phones with a thin case. TRUE TOUCH WINDOW: Easily use your smartphone without removing it. ADJUSTABLE: S/M fits 7-11 arm circumference, L/XL fits 11-17 arm circumference. WATER RESISTANT: Arm band protects your phone from sweat and light rain. INTERIOR POCKET: Conveniently carry your keys and cash in armband.