The Yurbuds Ironman Series Armband is designed for ultimate portability. It is made of a lightweight, flexible Neoprene fabric that ensures a comfortable, snug fit. The reflective coating is designed to allow for increased visibility at night. The armband features a two loop construction for use on arms of all sizes. The screen cover is made of a water resistant, heat-sensing material that allows operation of a touch-screen device while in the armband. When the Yurbuds Ironman Series Sport Armband is purchased from Amazon, customers can get an engraved YurSafety ID for only the cost of shipping. It is typically engraved with emergency contact information, medical information, etc, and can be fully customized at yurbuds.com. The armband is designed for use with the iPhone & Gen 4 iPod Touch, but is compatible with many other Android/HTC devices. Please contact info@yurbuds.com with specific inquiries. NOTE: The armband is large enough to fit an iPhone while still in a protective case.