Altra Updates Superior and King MT Trail Models for Spring 2018


This Spring, Altra has introduced two “half updates” to two of their popular trail models; in Altra parlance, a new whole number represents a significant redesign of the shoe, while a half-point (or .5) version has more subtle design changes along with new colorways. Both the Superior 3.5 and King MT 1.5 fall into the latter category, although there are noteworthy changes to both models.


Altra Superior 3.5 Altra King MT 1.5
Weight 10.3oz men’s, 8.2oz women’s 8.5oz men’s, 7.0oz women’s
Stack Height 21mm 19mm
Last RFS (Racing Foot Shaped) PFS (Performance Foot Shaped)
Midsole compound EVA / A-Bound Blend with InnerFlex Altra EGO
Rock protection Full-length removable StoneGuard Built-in full length rock plate
Insole 5mm contour footbed 6mm contour footbed
Outsole DuraTread rubber with TrailClaw 4mm lugs Vibram MegaGrip with 6mm lugs
Upper Quick-Dry Air Mesh Quick-drying and draining Ripstop nylon with drainage openings near toes and midfoot
Ideal use Ultrarunning, fast packing Fell running, off-trail scrambling, obstacle course racing
Color options 3 men’s, 3 women’s 3 men’s, 3 women’s
MSRP $110 $140


Altra Superior 3.5

Altra Superior 3.5
Primary updates to the Superior 3.5 include a lighter weight – a full ounce lighter than the 3.0 version – with an updated mesh upper. It also adds Altra’s four-point gaiter trap anchor points for increased protection from outside grit.

Gaiter trap attachments on both models

Thinner, durable uppers

Improvement of the uppers was a key development, as in our experience, the life span of Altra trail shoes is frequently determined by tearing of the uppers rather than breakdown of the midsole or outsole. The new mesh material feels more durable and abrasion resistant than the 3.0 version, but still retains its flexibility and comfort. Reinforcement on the sides of the upper is provided through overlays and an extended toe bumper.

The Superior 3.5 uses the same DuraTread and TrailClaw outsole from the 3.0 version, which positions rubber strategically along with exposed EVA to shave weight while making the lugs functionally deeper. The 4mm lugs are moderately aggressive, and spaced widely apart to shed mud easily. We love the tread pattern on this shoe, and we’ve found it very dependable to handle virtually any type of terrain.

King MT 1.5 outsole on top, Superior 3.5 outsole on bottom

Altra King MT 1.5
Altra’s original King MT shoe debuted last year, and was geared specifically for sustained water and mud exposure, such as you find in obstacle races with multiple water hazards, or European fell running – or for that matter, the majority of winter runs in the Pacific Northwest.

Altra King MT 1.5

One key distinction between the King MT line and the rest of Altra’s established trail running line is the use of the RFS last, which is cut slightly narrower than Altra’s PFS last without compromising the foot-shaped toe box. It’s a sleeker overall footprint that is designed to fit snug, which is important in sloppy conditions or when pushing the pace.

As with the Superior 3.5, the key construction updates are with the upper. The King MT 1.5 is optimized for rapid water drainage after immersion, with vent openings strategically placed on the medial side as well as the front of the toe box. The idea is that when you place weight through your forefoot at the end of stance phase, water in your shoe or sock will get squeezed forward, and when you pick that foot off the ground to swing it forward, the water can easily drain downward and out of the shoe.

Drainage vents at front of toe box

In addition to adding vent openings, the primary fabric of the uppers is a new ripstop fabric that is thin to the point of being nearly translucent, but has strong durability and flexibility. There is a new large stitched overlay on the medial side of the shoe for extra reinforcement in that area, and a number of welded TPU overlays to keep the foot anchored to the midsole. These all seem effective in securing the fit, and they avoid causing any unwanted creases or hot spots. The thinner upper material results in a slightly lighter overall weight for the King MT 1.5 compared to the original.

Medial overlay reinforcement; Velcro strap on laces

One piece that remains with the King MT 1.5 is the presence of a Velcro lock-down strap on top of the midfoot, which is something of a love-it-or-hate-it feature for many users. It wraps the entire midfoot and is helpful for adjusting the tension of your shoes quickly on the go; you can keep the strap loose on a long climb, then pull it down tight before bombing a downhill to prevent forward sliding. In our experience, the strap isn’t uncomfortable, but frequently isn’t necessary, as the regular lace system does a great job of holding the foot in place on its own. It’s also a convenient place to tuck laces underneath, but makes regular on/off application of the shoe a bit trickier than it should be.

Below the upper, the King MT 1.5 is largely unchanged. It utilizes Altra’s advanced EGO midsole material that combines soft cushioning with strong bounce resiliency, and is especially effective on a shoe with a relatively low stack height. There is a built-in full length stone guard for impact resistance, and the outsole features Vibram’s MegaGrip compound, which is the stickiest, grippiest, most advanced material the company offers. Based on its underfoot construction, the King MT is an excellent choice for cranking out speed on race day, but for longer events the relative lack of cushioning could become a challenge for some runners.

The Altra Superior 3.5 and King MT 1.5 are now available in both men’s and women’s styles at as well as other retailers.


About Author

Donald is a physical therapist, California native, barefoot aficionado, and father of three with more than 25 years of experience in endurance sports. He was a collegiate rower at UCLA, then dabbled in marathons and Ironman-distance triathlons before falling in love with ultras in the early 2000s. His favorite locations to run include Marin County, CA, and the Sierra Nevada mountains, and he loves exploring America's National Parks. When he's not training for ultramarathons, he enjoys hiking or slacklining with his family in Monterey County, CA.


  1. I really hope the new King MT material is more durable. I blew through the sidewall of my King 1.0s in about 150 miles. 150 miles for a $140 shoe is not good. I won’t be buying the 1.5 unless Altra offers some sort of mileage warranty on them.

    • At the weight the KINGS are I would think they would be used more for Obstacle racing or race days in general. I don’t think it was designed to be an everyday high mileage shoe.

  2. Thanks for the review! Question on distance: how short is short for comfort? 8 miles, 14, etc.? I know this depends on runner, but ballpark? I also found that really varying trail, such as steep OCRs, make my less comfortable shoes feel ok for longer because I think the less impact of one type, such as a long flat run, helps. Am I crazy?