Spira is a highly sought after brand of running and walking shoe. With rave reviews and product testing, it appears to be among the top choice for competitive running shoes. Their shoes utilize Wave Spring Technology that absorbs shock and returns that energy back to your feet and legs while maintaining their light weight. Sounds too good to be true, right? Well, believe it! Try a pair of their running shoes or walking shoes out for yourself if you don't believe it. I dare you!