Saucony ENDORPHIN SPEED. Born from speed, The Endorphin Pro 2 was designed to help you step up your race pace, one step at a time. A superior fit and more heel support mean you can keep your eye on the finish line. And with our ultralight PWRRUN PB and a carbon fiber plate, there's no doubt you'll get there faster than ever before. Like new. Only ran in these 4 times totaling 9miles. A bit firm for me but TONS of life left in these shoes. These come from a pet and smoke free home