The design of Sporteer Modular Armbands allows customization without purchasing an entire armband and ensures a perfect fit on every arm, whether the armband is worn directly on the arm or over clothing.
Strap Size Arm Size (upper arm circumference)
Small 8 - 10 inches (20 - 25 cm) - For THIN arms or wrists
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)
Wearing a thick, heavy phone like the Galaxy S8 Active on the arm is not...
If you have small arms or just want to keep your arms free while running...
The Sporteer Entropy Running Armband is designed to fit the Galaxy S8 Active with no case...