You cant wear the shirt till you cross the finish line and you cant cross the finish line if you dont train griffins trainer armband is built to go all the way with you from training day to race day trainer starts with a wide stretch armband that adjusts to fit arms up to 18 inches around a slide ring adjusts for a perfect fit then holds it in place trainer holds your iphone in a lightweight pocket perforated and backed with sweat wicking neoprene to allow airflow that keeps th