Description Holds your Apple Nike & iPod Sensor system while your running without the device bouncing, slipping or falling off. When to use it Use while running or walking with peace of mind that your iPod system will stay where you need it. Systems such as the Apple Nike & iPod Sensor are typically fitted into the sole of a Nike trainer where it means that you can track your run & send the data to your iPod device. With it, your iPod will detail you your time, distance, speed, & calories burned. How it works Made from reflective water resistant nylon. The Strid attaches securely to shoes, safely & quickly for super easy use & as an alternative holder for your iPod Sensor system.