eForCity Gym Running Sport Armband Case Compatible With iPhone&reg; 4 4G OS4 IOS4 iPhone&reg; 4S AT&T, Sprint, Version 16GB 32GB 64GB Adjustable Velcro Armband gives you the versatility of carrying your iPhone in a variety of ways. Armband is compatible with upper arm circumference: 10 - 15 inches. This durable, lightweight armband case keeps your iPhone secure and protected. Color: Black. Size: Perfect Fit.