The Pod
By Shoe Sense
Shoe cushioning increases the comfort for the runner as well as absorbing impact during running. However, the shoe cushioning degrades with use and worn out shoes should be replaced.
Some experts recommend a mileage limitation of 300-500 miles. 
When the shoe cushioning degrades, the foundation of the shoe becomes weakened. This leads to increased risk of musculoskeletal injuries.
The challenge for most runners is that there is no accurate way to determine when their shoes are worn out. Must runners postpone replacing their shoes until something hurts and that may be too late. 
The Shoesense App and Pod allows any runner to track their shoe wear and run efficiency, and ultimately pick the perfect shoe for them.