VanGoddy Sweat Proof Black Neoprene Armband for ZTE Sonata 2 Smartphone Double layered Neoprene construction provides comfort and durability Rear of the armband features small slip pocket for a house key Adjustable strapping and extender piece offer a universal fit | 10.5"-13inches without extender piece & 15"-20inches with extender piece Cell phone compartment measures 5" X 2.80" X 0.50inches