The GEL-NIMBUS 20L on D on marathon shoe features the revolutionary FlyteFoam technology for optimal comfort and responsive guidance for the neutral runner. It has a mesh jacquard upper that is blended and strategically tight or loosened in the areas to allow the natural movement of the foot. It is designed with 3D printed overlays that provide seamless support to the upper. The gel padding system on the heel and forefoot absorbs shock during the stages of impact and detach and allows movement on multiple floors while the foot passes through the step cycle. The speva insole offers bounce and cushioning. The Trusstic system integrates the construction of the guide for greater gait efficiency and at the same time ensures the structural integration of the central foot. Have any questions/concerns? Please leave leave a comment or DM and I will get back to you ASAP:) Bundle 2 or more posts to save on shipping and score a surprising discount! Shopping sustainably helps out Mother Earth \^-^/