The LifeProof case lets you run, bike, boat, and swim without fear of damaging your iPhone, and this LifeProof armband is designed to keep your device securely attached to you during activities. Thick padding on the armband protects your skin and delivers comfort during workouts, while nonslip silicone dots keep your armband in place. Adjustable armband accommodates 10"-15.2" biceps. Smooth waterproof lycra material is perforated to provide excellent breathability. Lifeproof case sold separately.