The Classic M6 Modular Armband fits most small and mid-size phones with no case or thin cases 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 phone and cases up to 150 x 75 x 10 mm.
If your phone is larger the 150 x 75 x 10 mm, we recommend the Classic MX Modular Armband.
Strap Size Arm Size (upper arm circumference)
Small 7 - 9.5 inches (20 - 25 cm) - For THIN arms or wrists only
Medium 10 - 14 inches (25 - 36 cm) - Fits most arms/most common size
Large 13 - 18 inches (33 - 46 cm) - Fits large arms or over clothing
Extender + 4 inches (10 cm)