Article by Jana Herzogova
Mount to Coast R135 ($170)
Introduction
This review is based on my personal experience with the Mount to Coast R135 (Badwater Edition), a shoe I’ve used extensively for training runs, gym sessions, and long efforts in the heat.
I also had the opportunity to crew and photograph the legendary Badwater 135 ultramarathon, which gave me a real-world look at how the R135 performs under extreme conditions.
Alongside the R135, I’ve also tested the Mount to Coast R1 (RTR Review), which shares the same platform and foam. I’ve logged about 15 miles in the R1, so my feedback there is based on early impressions, not long-term use.
Please note: all photos in this review are of the R135 Badwater Edition—I don’t currently have images of the R1.
This review breaks down the similarities and key differences between the two shoes across five categories, helping you decide which one fits your needs best.
Pros:
Exceptionally lightweight given its cushion and structural design
Highly breathable, fast-drying woven mesh upper engineered for extreme heat (Badwater conditions)
Reflective midsole and upper accents enhance nighttime visibility—ideal for dusk-to-dawn runs.
TUNEDFIT dual-zone lacing offers independent forefoot and midfoot tension control for comfort and lockdown.
Durable LightCELL midsole with ZeroSag inserts delivers consistent bounce and structure even after long milesStable and smooth ride, suited for ultra-distance pacing over asphalt and varying road terrain
Cons:
The upper may feel slightly narrow or low-volume for runners needing high-volume shoes—especially in the midfoot.
Stats
Spec Weight: 7.9 oz /225 g US M9
Sample Weights: women's 7.9 oz /225 g US 10.5 (R1 regular version 8.5 oz / 240g)
Stack Height: 35mm heel / 27mm forefoot
90 mm heel / 80 mm midfoot / 120 mm forefoot US M9
First Impressions, Fit and Upper
Similarities
Both shoes feel lightweight, breathable, and built for serious pavement mileage.
They feature the same dual-zone lacing system, which lets you customize lockdown across the midfoot and forefoot—great for dialing in a secure fit or compensating for swelling during long efforts.
Differences
The R1 has a clean, minimal engineered mesh upper with a performance-oriented fit—snug through the midfoot, slightly structured, and dialed for control. It feels fast and lean.
The R135, however, builds on that base with refinements for extreme conditions. The upper is more perforated and noticeably more breathable, making it ideal for hot-weather training and racing. It also includes reflective elements throughout the upper, which make a big difference when you’re running early mornings, late evenings, or overnight.
The toe box on the R135 is slightly roomier, giving your foot space to breathe and swell without compromising lockdown.
Bonus: The R135 is an excellent option for night-time runners, thanks to its enhanced visibility and reflective details.
Midsole & Platform
Identical
Both the R1 and R135 use the same LightCELL PEBA-based foam, with identical stack height and geometry. This midsole is responsive, firm (but not harsh), and delivers consistent energy return mile after mile. It’s not a max-cushion feel, but it provides reliable protection and structure over long distances.
The platform is stable, efficient, and built for road ultra performance. No difference here—if you like the ride of one, you’ll feel right at home in the other
Outsole
Identical
Outsole design, rubber coverage, and performance are the same in both models. They grip well on pavement—dry or wet—and hold up under high mileage without premature wear.
That said, neither shoe performs particularly well on turf or indoor surfaces, especially during sled pushes/pulls or explosive gym movements. The outsole just doesn’t bite into artificial turf the way a cross-trainer or dedicated gym shoe would.
However, I still use the R135 in the gym. The light weight, stable platform, and solid lockdown make them great for treadmill runs, lifting sessions, mobility work, and general training. The R135 especially holds its own in the gym—even though it’s not designed as a gym shoe, it still performs well in most areas.
Ride, Conclusions and Recommendations
R135 compared to R1: Identical in Feel, Slightly Different in Experience
Both shoes deliver a structured, efficient ride that’s consistent, stable, and energetic. There’s no softness overload, no sink-in sensation—just responsive rebound that holds up even when your legs don’t.
The subtle difference comes from the upper:
The R135 feels a bit more forgiving and breathable, especially noticeable on long, hot runs or multi-hour efforts where your feet swell or need ventilation.
The R1 feels a little more dialed-in and performance-focused, especially for shorter efforts or cooler conditions.
So while the midsole and platform are identical, the upper changes the ride experience slightly depending on your environment.
And as a result, the R135 weighs 15g / 0.6 oz less in the reference US men’s 9 which is the same size as my women’s US10.5.
My Score: 9.53 / 10
Ride - 9.5; Fit - 9.5; Value - 9,5; Style - 10
😊😊😊😊😊
I am very happy with this model as my daily trainer. So much so that I purchased 2 extra pairs. No wonder they sell out fast!
Index to all RTR reviews: HERE
R135 Badwater is available (Limited Edition)
Mount to Coast SHOP HERE
Tester Profile
Jana Herzgova took up running in 2016, after a back injury. Prior to that she was a speed skater, but due to back pain and doctor's recommendation, she transitioned into running. Since then, starting with shorter ultra distance races she quickly evolved into an avid long distance and unsupported mountain runner. She also loves to take on challenges/races in arctic and subarctic climates, mainly in unsupported and semi-self supported style. She currently lives in Utah/Wyoming.
Samples were provided at no charge for review purposes. No compensation was provided by brands for writing this article. RoadTrail Run does have affiliate partnerships and may earn commission on products purchased via shopping links in this article. These partnerships do not influence our editorial content. The opinions herein are entirely the authors'.
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