Altra Duo 1.5 running shoes are here with some must-have updates for fans of this max-cushioned, Zero Drop™ racing shoe! Updates include an improved heel collar, a more durable rubber outsole, and light, fast MAX-LT™ cushioning. Don't worry: The Foot-Shape™ toe box is still a part of the design, giving runners plenty of room for their toes to splay. Plus, the women's version utilizes Fit4Her™ technology, which provides a fit that's more aligned with the anatomy of female feet.

Upper: Lightweight, flexible engineered mesh upper offers breathability. Lace-up front offers an adjustable fit. Updated heel collar and strategic knitting pattern provide a more secure fit all around.

Midsole: MAX-LT™ cushioning sits atop the Zero Drop™ platform for an ultra-soft feel that lets your foot move more naturally.

Outsole: Vibram® MegaGrip™ rubber outsole for enhanced durability.