Get ready for your next 5K or go all way and train for a marathon in these Kayano distance runners Engineered stretch knit mesh upper Reflective detail to improve visibility PureGEL rearfoot technology is strategically positioned the heel for a 65% softer ride than the conventional GEL technology Hybrid ASICSGRIP outsole offers better grip with softer underfoot Adaptive 4D Guidance System Knit collar construction with pull-tab offers a modern step-in with easy on/off access FF Blast Plus Eco cushioning is made with approximately 20% bio-based content and helps provide cloud-like comfort External back heel counter helps keep the foot stable and provide a more comfortable stride Asics Men's Kayano 31