Altra Zero Drop 3-Sum - Three. The number of events that make up a triathlon. The 3-Sum™ from Altra Zero Drop™. A speedy, ultralightweight companion you can count on to carry you across the finish line.
Altra Zero Drop recommends that those new to natural running and zero-drop footwear transition slowly by wearing these on shorter runs and gradually building up to regular mileage.
A natural running shoe with a zero-drop differential that is designed for the neutral runner looking for a barefoot-inspired feel without sacrificing cushioning.
Ideal for triathlons, running, road racing and speed work.
Lightweight, quick-drying air mesh upper.
Yankz Quickdraw laces allow for a secure fit and quick transitions.
Tongue and heel loops for quick-and-easy entry and exit.
Contoured heel cup for added comfort.
Seamless, sock-free design with antimicrobial lining.
Includes 5 mm Contour insole for light underfoot cushioning.
Dual-layer midsole is made up of EVA and A-Bound™ material.
Zero Drop™ Platform promotes a more natural foot strike and a more efficient stride.
Total Stack Height (total thickness of the shoe): 18 mm.
FootPod™ delivers optimal flex, responsiveness and traction.
Foot-shaped design allows the foot to splay naturally and helps maintain proper alignment, while maximizing shock absorption and promoting a more powerful toe-off.