Let Eternity NITRO be your guide. The engineered mesh upper integrates the runGUIDE tech, designed to hug your midfoot for an effortless ride. For the midsole, NITRO foam provides superior cushioning, combining with other tech elements to give you support: a TPU heel piece for proprioception, reflectivity, and a durable rubber PUMAGRIP for all-surface traction. You lead the way, Eternity NITRO will keep you in line. Distinctive design options aren’t enough. We want to be the first brand to create a speciﬁc last for women’s running shoes that take her into consideration—shape, ﬁt, and contour. Our new women’s running shoes are made to ﬁt the proﬁle of the female foot so she can run in comfort and reach her goals with a narrowed heel, lower instep, and adjusted women's arch ratio.