The Shoe Pouch was designed by Grantwood Technology, LLC to allow runners and walkers to use the Nike+iPod Sport Kit® with any type of shoe. When designing the Shoe Pouch, our primary goal was to ensure a very snug fit. Not only does this minimize the risk of the sensor falling out while exercising, it also allows the sensor to transmit accurate data. The Shoe Pouch maintains the correct longitudinal alignment of the sensor, completely covers the sensor and attaches through the laces for excellent security. With a low profile, secure, neoprene design, the Shoe Pouch is the answer to using the Nike+iPod® with any style of shoe. With over 14,000 sold, we have saved our customers well over a $1,400,000 in purchases of new Nike+ shoes. We stand by the Shoe Pouch as our product and look forward to you becoming another happy customer.