The 3-Sum™ is the sum of the three event triathlon experience. Lightweight, fast, and lightly cushioned, the 3-Sum™ is built for triathletes who demand the ultimate in performance. With a seamless upper, easy-on transition pull-tabs, quick-draw lacing system and heel/forefoot drain holes, the 3-Sum™ minimizes transition time and maximizes performance.
The Zero Drop™ design allows for natural loading of the calf and Achilles, while optimizing the landing angle to ensure powerful speed with minimal impact. The Altra 3-Sum™ – get off the bike and run like there is no tomorrow!
- Ideal Uses: Triathlons, Running, Road Racing, Speed Work
- Designed to Reduce: Your PR, Shin Splints, Knee Pain, Forefoot Pain, Bunions
- Platform: Zero Drop™ Platform, Foot-Shaped Toe Box, Natural Ride System
- Weight: 6.7 oz
- Stack Height: 18 mm
- Midsole: Blended EVA/AltraBound™
- Outsole: Blown Rubber SpeedPod
- Insole: 5mm Contour
- Upper: Minimal Liner / Sock-free Liner, Treated for Anti-odor / Anti-bacterial
- Lacing Structure: Custom Yankz Quickdraw Laces for customized fit and faster transition
- Other Features: Seamless upper, Easy-on Transition Pull Tabs, Quickdraw Laces, Heel and Forefoot Drain Holes, Vegan Friendly, Natural Ride System