 They use Verso shock technology, which is a term I didn't even understand until I put them on. But long story short, you bounce down the street in these things and probably feel a lot lighter than you are in my case. Okay, in your case, if you're suffering from any type of discomfort, these things are a home run because your joints aren't going to take the beating they do in traditional EVA foam soles. So my advice, head over to GDefy.com. The code is JIMMY.