Universal Armband Extender. Many of us know the story - you finally get that great armband youve wanted and then you realize - Wait a minute - the band is not long enough! Those of us with large arms deal with this sort of thing all the time. But no worries - weve got you covered! Length - This useful strap extends your max armband size by 6 inches. We encourage you to check the circumference of your arm using a tape measure. Similar to how you might measure your waist. Compatibility - This extender is universally compatible and can be used with most armbands with a 2 inch strap. If youre in doubt post a question and well get back to you.