Gear Beast Sports Armband Strap Extender for Gear Beast Deluxe, Premium & Case Compatible Armbands & Other Popular Brands (Black) Armband Strap Extender allows users to extend the armbands strap to accommodate arm circumferences of 16 to 20 inches for Deluxe, Premium and Case Compatible Armbands Compatible with Gear Beast Deluxe, Premium & Case Compatible Armbands & Popular Brands such as Tunebelt, Minisuit, Avantree, STALION, Engive, Belkin, i2Gear, Shocksock and Many More. Made from the highest quality neoprene to provide a comfortable fit while wicking moisture. Gear Beast has incorporated Comfort Piping on the outer edges of all of our armbands to eliminate friction and discomfort caused by the unpadded edges. Customer satisfaction is our top priority, please do not hesitate to contact us if your Armband does not meet your expectations.