Dynamic Fit technology delivers a one-to-one fit. Engineered mesh upper offers lightweight ventilation. Zoom Air units provide responsive cushioning. Partial mesh bootie wraps the foot for a plush, comfortable fit. Notches at the tongue provide easy on and off. Fitsole sockliner conforms to the shape of your foot to provide comfort and underfoot support. One thing I’m never short of is Running Shoes :-). I ran on it few miles and feel awesome. Pre owned shows sign of minimal wear. As is