Altra 3 Sum -
Easy on and easy off, that's the idea behind the Altra Women's 3-Sum Running Shoe. Cushioned, shaped like your foot, and built around a zero-drop midsole, this is a shoe for triathlon racing and speed work. Altra's designers went to great lengths to match the fit of this shoe to the shape of a woman's foot, and the end result is far from the typical 'shrink it and pink it' women's offering. Inside this shoe, your toes are able to relax, and your heel and forefoot are the same height from the ground. On the outside, you get quick-pull laces and an easy-on tab to speed up transitions. With the 3-Sum, you can run all-out the natural way.
- Together, the midsole and outsole make for a 18mm stacked height from the surface of the ground to the bottom of your foot
- Midsole features an Altrabound top layer that feels springy so the midsole returns energy to help you glide through your stride
- Soft, EVA midsole provides cushioning and reduces impact on your ankle and knees
Support and Cushioning:
- SpeedPod lugs are mapped to support the bones of the foot for the most natural feeling throughout foot strike and toe off
- 5mm Contour footbed provides support and minimal cushioning to keep your foot comfortable without adding unnecessary weight
Traction and Grip:
- Blown rubber outsole offers moderate flexibility to complement the natural-running style of this shoe and provides ample traction on the road
- Seamless synthetic upper feels smooth against your foot and doesn't require you to wear a sock inside
- Heel and forefoot drain holes allow water to move quickly out of the shoe and away from your foot
- Zero Drop Platform (0mm) features a 1:1 heel-to-forefoot height ratio, which means that your heel and forefoot sit exactly the same height from the ground
- PRS2-W last offers a narrower heel, longer arch, narrower midfoot, and a higher instep than the men's PRS2-M last
- Asymmetric, quick-draw laces provide a fast and secure way to get these shoes on and off during transitions
When every ounce counts, slip into the lightweight Altra 3 Sum™ performance running shoe. From everyday runs to triathlons, this Zero Drop™ women's slip-on athletic shoe keeps you nimble and lightens your load with a seamless, synthetic upper and 5mm contoured footbed. Featuring Altra's Natural Ride System (NRS) and a women's-specific design, this shoe includes a foot-shaped toe box that provides room for toes to move freely, improving both comfort and balance. Drainage holes channel away water after amphibious activities. A blown-rubber speed pod outsole gives you dependable ground control whenever you set out in the Altra 3 Sum™ running shoe.