Sleek armband offers easy-touch window. Ergological design integrates NDurAthletic and moisture-wicking material. Fits iPhone 5, iPhone 4, and 4S and is Ant+ dongle compatible.*Unique hybrid of polyurethane and performance textiles deliver enduring protection*Soft ergo-armband optimizes comfort and eliminates friction*Moisture-wicking material moves sweat away from body and adds breathability*Reflective hits promote low-light visibility up to 1200 feet