I've been running now for 45 years. As I got into my late fifties I started to have chronic pain on top of my feet. This affected every aspect of my running from enjoyment to stride efficiency. I just receive my pair two days ago and have logged 15 miles so far. It's amazing the foot pain is gone and I've got my full and proper stride back. It's as if I've turned the clock back to 20 years ago. I bought these thinking yeah yeah, yeah, another product with hyped up claims. Boy was I wrong!