STEADFAST BLACK FITGO WOMEN'SXeleros Steadfast is perfectly suited for running and walking. The Steadfast has dual control plates which provide a quicker response through the gait cycle. The patented Xelero technology insures stability while encouraging forward motion. The Xelero midsole provides light weight cushioning while the seamless lining optimizes comfort. The extra cushioning EVA insole provides another layer of comfort. Moisture wicking linings keep your feet dry.