Entropy Modular Armband Strap

The modular design of Sporteer Entropy 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.

New customization options coming soon!


  • Three sizes for perfect fit on bare arm or over clothing
  • Reflective tabs for safe running at night
  • Soft, durable Velcro across entire length of strap for maximum flexibility and comfort 

Strap Size           Arm Size (upper arm circumference)

   Small                          8 - 11 inches (20 - 28 cm)

 Medium                     10 - 14 inches (25 - 36 cm)

  Large                        13 - 18 inches (33 - 46 cm)

Extender                         + 4 inches (10 cm)

Related Items