NIKE Men's Air Zoom Pegasus 34 Running Shoe Synthetic Synthetic sole 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.