From 5Ks to full marathons, the Gel-Kayano 30 shoe is designed to provide advanced stability and softer cushioning properties. . The new 4D Guidance System helps provide adaptive stability. This helps you experience a more supportive and balanced stride during your distance training. Its midsole is revamped with FF Blast Plus Eco cushioning and a 4mm stack height increase. With approximately 20% bio-based content, this material helps create cloud-like softness in every step. The new PureGel technology is strategically positioned below the heel for a smoother ride. It's 65% softer than conventional visible Gel technology, allowing your distance training to feel surprisingly smooth. - Engineered stretch knit upper improves breathability. - External back heel counter helps keep the foot stable and provide a more comfortable stride. - 4D Guidance System feature helps create adaptive stability for a more balanced stride.