Gum Rubber sole THIS SHOE IS FOR: Runners who need support and love all the bells and whistles. This shoe combines our best cushioning with seriously innovative GuideRails support. The result is a shoe that feels incredibly comfortable mile after mile. SUPER-SOFT CUSHIONING: The DNA LOFT cushioning provides a soft, luxurious feeling underfoot without losing responsiveness or durability. MAXIMUM COMFORT: New OrthoLite sockliner provides premium step-in comfort. PLUSH FIT: The plush feel of an internal stretch bootie surrounds your foot and moves and expands with your stride. The engineered mesh upper and 3D Fit Print technology only enhance the fit. HOLISTIC SUPPORT: We’ve shifted our focus beyond the feet to the most injury-prone part of a runner’s body: the knees. GuideRails support keeps you moving comfortably by keeping excess movement in check.