The Nathan Sonic Boom is a sleek armband with an 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