I was a runner back in the 1970's and footwear was not as good as it is now. I was also a Professional Registered Nurse, on my feet all the time. I have developed Neuropathy which made me disabled. I no longer run, but when I walk in the Cloudmonster 3's, I feel like I did before the Neuropathy. I think the double keyholes in the soles, make the difference. I hope they continue this line and create sandals and more footwear with the same cushioning and soles.