Microsoft Lumia 640 XL - Adjustable Armband Gym Running Jogging Sports Case Cover Holder + Polishing Cloth ( Black ) Wide range of fitment. Special vented design. The armband is made from a soft neoprene type waterproof material with a clear front face, offering protection against moisture, scratches and impact for the body. Wrap it round your wrist or your arm and slide in your device, where it will stay safe & secure. Comes with GBOS Polishing Cloth For your Mobile Phone.