The Classic M6 Modular Armband fits the iPhone 5, iPhone 5S, iPhone 6, iPhone 6S, iPhone SE, iPhone 7, iPhone 8, Iphone X with no case or a thin case and is the best armband choice if you want the least amount of bulk on your arm while running or working out.
The Classic M6 Modular Armband fits cases up to 150 x 75 x 10 mm.
Features:
Arm Size (upper arm circumference) - 10 - 14 inches (25 - 36 cm) - Fits most arms/most common size