Wearing your smartphone on your arm as you workout is not a bad idea. But you are going to need the right tool for the job. The Syte Sleeve lets you carry and use your smartphone while you are exercising. It is useful when you are running, biking, or working out in the gym. The Syte Sleeve is made of durable, elastic sleeve with forearm grips for added stability. It uses a moisture wicking material to keep you cool. The pocket is transparent and detachable. You can use your phone with or without a case. Like what you see? This project is on Kickstarter.