Since I am not running in Nikes, I have to use this pouch to attach the senor to my shoelaces. Purchased at Amazon. It is extremely light, waterproof, and fits securely and is straight on the top of my shoelaces. Placing these flat and securely on your shoe is utterly important, less your mileage/pace will register slightly off. All in all, I'm very happy with being able to run in my usual shoes while using the sensor.