Design 3D GUIDANCE SYSTEM(TM) enhances stability for a more balanced stride Engineered mesh uppers improves breathability and wraps the foot with a soft feel Lightweight design is ideal for daily training and various distances In-Shoe Comfort PureGEL(TM) technology provides lightweight cushioning and softer landings FLYTEFOAM(R) Cushioning offers a comfortable and responsive ride OrthoLite(TM) Hybrid Max sockliner provides soft step-in comfort Additional Details Surface: Road Heel Drop: 8 mm Weight: 270 g (9.5 oz)