I reviewed the Salomon S Lab Ultra trail shoe last July at about 1000 km of use. The shoe was performing well across the board and was stacking up to be better than the excellent S Lab Sense Ultra that proceeded it. The fit, stability, and comfort were superior to any Salomon shoe that I have used. The SensiFit “stability” straps that were initially considered overkill or gimmicky have been found to be highly functional in truly technical terrain. The only downside to the shoe was the weight- it weighs more than the S Lab Sense Ultra by almost 10%. But I have never specifically noticed the increased weight and perhaps that is because of the slightly improved fit, increased stability, and overall superior comfort of the S Lab Ultra when compared to the Sense Ultra.
This post will document exactly how well the S Lab Ultra has held up for use exceeding 2500 kms- the bottom line: exceedingly well!
I have used the S Lab Ultra for a wide variety of training and racing. These uses include 10-13 h of weekly trail running on 50/50 (technical/smooth) trails in the Northern Rocky Mountains, many 1 hour bounding sessions up steep terrain, many lactate threshold (LT) and VO2max interval sessions in hill repeat mode, many LT and VO2max interval sessions on rolling terrain at and exceeding critical velocity, numerous trail races from 20 km to 42 km, and a little bit of road running*.
The S Lab Ultra has performed outstandingly in all of these uses and particularly in steep, loose climbs and descents. The SensiFit “straps” do a great job of stabilizing the foot in loose conditions and allow for noticeably more traction and control. The shoe has been an all-around performer.
I have just now retired these shoes. Although they are still performing, I feel a bit less traction on downhills due to lateral heel wear and rather than go down I have started a new pair for the season.
With the exception of the S Lab Sense Ultra, I have found that trail running shoes typically wear out somewhere on the upper first- developing a hole and allowing debris into the shoe and thereby making the shoe not useable. In the case of the S Lab Ultra (as in the predecessor S Lab Sense Ultra), the upper has been incredibly durable. Only in the last 500 kms have any holes developed and those that have are very small and have not allowed debris into the shoe. The following are a few images of the various areas where holes have developed or abrasion has begun to compromise the upper.
It is apparent that the substantial polymer overlays used in S Lab Ultra have increased the durability of the upper as these overlays both protect the underlying fabric and limit the extent to which a hole can grow. This is perhaps not a primary intended use of the overlays but it certainly has worked out that way. With the exception of the S Lab Sense Ultra, the uppers of other S Lab shoes without these more extensive overlays have worn out much earlier due to large holes.
The fit has remained “ultra”-comfortable throughout the life of the shoe. The shoes have become very much an extension of my foot and essentially disappear from my thoughts while on technical terrain allowing a total focus on foot placement and rep-rate.
This is likely the most remarkable experience with these shoes- the midsole is just not loosing it’s cushioning effect or rock protection. Although certainly less than a new pair, the midsole comfort is still there and still allows for long runs with no concern for foot comfort. In addition the ProFeel Film rock protection is entirely intact and performs as well at 2500 kms as it did when new, although exhibiting a bit less longitudinal stiffness. The S Lab Sense Ultra midsole and rock protection began to breakdown somewhere around 2000 kms- excellent performance but this shoe is even better.
The outsole has been similarly durable and the Premium Wet Traction ContraGrip compound has performed well throughout in both wet and dry conditions. With the exception of lateral heel and forefoot wear, the lugs are still providing excellent grip across the board. At 2500 kms this is nothing but remarkable in my experience.
This use works out to about $0.12/mile ($0.07/km) which, with the exception of the S Lab Sense Ultra 2017, is about a factor two better than any other shoe that I have used.
None, yes none! I put these shoes on and have run over 1500 miles in them and never once had to deal with an issue, discomfort, or compromise.
An outstandingly durable, high performance trail shoe that will not disappoint. Given that the 2019 replacement S Lab Ultra 2 has only minor changes (it appears that Salomon have only removed the forward-most SensiFit strap and left everything else alone) one can expect a similar experience with the new model. Some have noted that the last is a bit narrow so try these shoes on to ensure that the “narrowness” is acceptable. The Salomon S Lab Ultra is highly recommended.
*(Although I will run distances greater than 50 km in training, I do not race ultras anymore. I find the GI issues to be not only annoying for a competitive runner but, more importantly, I have the basis to assert that these GI issues are unhealthy. So no more ultra races for me.)