The 3-Sum


4.5 / 5.0

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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!

Technical Stuff

  • Ideal Uses: Traithlons, 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

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Customer Reviews for the The 3-Sum

Skeptic turned Believer
By Hills McGee on Apr 18, 2014
Average Rating: 5.0 / 5.0
I have been running in pain for the past 4-5 years. I have had reoccurring metatarsalgia and frequent knee pain. The first run with the 3-sum was completely pain free. And so far, I have had 10+ runs to the same tune. This shoe is stable, lightweight, and has corrected my running form to be much... (Read more)
Careful with sizes...
By Shane on May 2, 2013
Average Rating: 4.0 / 5.0
I ordered a pair same size as my provisions size 10 us. When they came in they were too small and should have ordered an 11 us.
Refined Precision
By OrangeClownShoes on Jun 11, 2013
Average Rating: 5.0 / 5.0
Ran in my orange boots yesterday for the first time, they are incredibly smooth and stable for a minimalist shoe. The ride was simply fun and explosive. I have not mastered the speed laces yet, but I will say for a shoe that you can pull on and off, the fit was just secure enough. Altra's online c... (Read more)
Comfortable ride
By MurphyBoys on Jun 14, 2013
Average Rating: 5.0 / 5.0
The look caught my eye, love the colors and design. My first pair of Altras; could not feel better on my feet. I always wear a size 12 but needed a 13.
Awesome shoe, no questions asked...
By PeteDin206 on Jul 10, 2013
Average Rating: 5.0 / 5.0
After my friend turned me on to the Altra Lone Peak 1.5's for trail running, I figured I'd give the 3-Sum a shot for triathlons. These things are light, comfortable and provide great ground feel. I've got my first race coming up next weekend and can't wait to throw down a run PR in them.
heel chafing
By Erik on Aug 16, 2013
Average Rating: 2.5 / 5.0
I run all my tri's sockless, so I won't be able to race in this shoe. The yellow trim around the heel tab is rough, and it rubs my Achilles tendon raw. The rest of the shoe is great, and I love the wide toe box. Maybe they will fix this for next year. It works fine with socks.
My go to shoe
By TheDude on Sep 4, 2013
Average Rating: 5.0 / 5.0
Slipped on the 3-Sum straight from the box. Started running down the gravel road I live on. A warm breeze washed across my face. In an instant my mind flashed to my childhood. I was a kid again running barefoot in the long cool grass. That is how comfortable these shoes are. The color is pretty soli... (Read more)
Awesome awesome awesome
By Steelogic on Sep 15, 2013
Average Rating: 5.0 / 5.0
I've tried pretty much every shoe on the market. This shoe is comfort, speed, and mechanics all wrapped up in a perfect orange package. Nothing better for triathon!
absolute bliss....
By Pierre on Sep 19, 2013
Average Rating: 5.0 / 5.0
I did purchased them in May. Did a full season with it. Cleaned them with mild soap and hoose (just love their crisp colour). Anyway never had something like that after. No change, no alteration required. fast to slip in. As confortable as a pair of sleepers, even when wet (and this is something t... (Read more)
Good but not great
By BlisterBoy on Oct 13, 2013
Average Rating: 3.0 / 5.0
I would first like to say I am a huge advocate of any Altra. I talk about them to everyone who will listen and anyone who asks. First off, the size issue has been mentioned by everyone. Order a size up from your last Altras. Maybe only a half up. Just play with it till you find the right fit. ... (Read more)
Fast and responsive shoes
By MitchRunning on Oct 20, 2013
Average Rating: 4.5 / 5.0
I buy this pair of shoes, at the expo of rock and roll marathon montreal. I run with saucony kinvara 4mm drop, but with this shoes i'm fast and after each run i feel better and less hurt on my feet. I love it
By drillnow on Oct 27, 2013
Average Rating: 5.0 / 5.0
I just received the ALTRA shoes. Before I ordered them I called as there is nothing for how wide these shoes come in. I was told that there is no sizing for them but the shoes are wide. I normally order as wide a size I can get. These shoes are fantastic but are too narrow for me. Reason I post this... (Read more)
Excellent Multi-purpose Shoes
By Alex Fang on Nov 11, 2013
Average Rating: 5.0 / 5.0
I really hope Altra NEVER decides to discontinue this shoe. It's my go to baby-in-my-arms, slip-on shoes. They are comfortable for running around the lake, going to the back yard, playing with my kids at the park, etc. The tread of the shoes also have excellent grip. I can walk up the smooth sto... (Read more)
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