Engineered mesh upper A lightweight mesh material that reduces the need for additional overlays. Knit heel pull tab This comfortable heel tab makes the shoe easier and more comfortable to put on and take off. 4D guidance system feature A dynamic pod designed to intuitively respond under excessive load. This response provides stability and comfort for the duration of a run. Rearfoot PureGEL technology Softer, updated version of ASICS' GEL technology. Approximately 65% softer vs standard GEL technology. FF BLAST PLUS cushioning Midsole foam that provides a blend of cloud-like cushioning and a responsive ride that is lighter than FF BLAST Technology. OrthoLite X-55 sockliner Premium sockliner that provides cushioning performance and moisture management for a cooler, dryer environment. Reflective details Designed to help improve visibility in low-light conditions. HYBRID ASICSGRIP outsole Combines ASICSGRIP rubber and AHARPLUS materials to help provide advanced grip for various terrains and advanced durability. The sockliner is produced with the solution dyeing process that reduces water usage by approximately 33% and carbon emissions by approximately 45% compared to the conventional dyeing technology.