Note: This product is available in the US only.
We offer free shipping on all orders and the estimated delivery time is 2-5 working days in the US.
We offer free return or exchange on unworn, unwashed shoes within 30 days.
Men's
| USA | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 12.5 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 40 | 40.5 | 41 | 42 | 42.5 | 43 | 44 | 44.5 | 45 | 46 | 47 | 47.5 | 48 | 49 |
| UK | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 | 11.5 | 12 | 13 |
| CM SIZE | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 | 28.5 | 29 | 29.5 | 30 | 30.5 | 31 | 32 |
Women's
| USA | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 | 9.5 | 10 | 10.5 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EUR | 35.5 | 36 | 36.5 | 37.5 | 38 | 38.5 | 39 | 40 | 40.5 | 41 | 42 | 42.5 | 43 |
| UK | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7.5 | 8 | 8.5 | 9 |
| CM SIZE | 22 | 22.5 | 23 | 23.5 | 24 | 24.5 | 25 | 25.5 | 26 | 26.5 | 27 | 27.5 | 28 |
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Size Measuring Guide
A perfect fit for your ultra-marathon running shoes is important for comfort and performance. Follow these tips to measure your foot size at home:
General Tips:
- Measure your feet at the end of the day as they're at their largest due to swelling.
- In between sizes? One foot is bigger than the other? Take the larger size.
- It's best to measure every year. Your size could change over time.
What You'll Need:
- A piece of paper larger than your foot,
- A pen or pencil,
- A ruler or measuring tape,
- Socks of the thickness you'll wear with the shoes.
Steps:
- Stand on the paper in the socks you'll wear with the shoes.
- Use the pen or pencil to mark the end of your longest toe and the back of your heel. It's important to measure both feet as their size can vary.
- Match your measurements to our size chart to find the best fit. If you're between sizes, we suggest choosing the larger size for better comfort.
Featured
For the R135 we switched out the upper of the R1 for an ultralight, breathable, and fast-drying woven mesh fabric engineered for the hot conditions of the Badwater® 135. The result is a shoe that weighs just 7.9 oz / 225 g (US M9), 6% lighter than the original design.
The Badwater® 135 involves running through the night on desert roads. Safety is paramount, so the R135 incorporates a reflective coating on the midsole to enhance visibility for safer racing from dusk till dawn.
Underfoot the R135 maintains the tried and true record-breaking formula of the R1: TUNEDFIT Dual Lacing System for on-the-fly fit customization, with dual-zone ZeroSag and LightCELL midsole to boost comfort for the duration of the longest runs.
Be Badwater Ready.
Gallery
Customer Reviews
So there I was, casually hopping onto the Mount to Coast website—just minding my own business, looking to replace a beloved, battle-worn pair of R1s—and BOOM. Out of nowhere: the R135 Badwater Edition drops like a meteor of running glory. No warning. No teaser trailer. Just here it is, now try not to scream. Spoiler: I screamed. And then I clicked that order button like it was a race to the checkout line at a Black Friday doorbuster.
And let me tell you something… I snagged these stunners moments before the social media world caught wind. That’s right—beat the algorithm to the punch. That alone should earn me some kind of elite status, right?
Now let’s talk about what actually matters—the run. I laced these beauties up for a weekend long run that could only be described as a heatwave hustle. The kind of day where the sun is trying to boil your toenails off. But the R135? Cooler than a popsicle in a kiddie pool. That lightweight upper? Chef’s kiss. My feet felt breezy, supported, and strangely flattered—like the shoes themselves were saying, “Damn, Steve, look at us go.”
The updated design isn’t just sleek—it’s got attitude. The pops of color, the metallic silver hits? This is race day flash meets long-haul grit. It screams high performance with a wink. And the comfort? Look, I’ve run in a lot of shoes. I’ve broken up with a lot of shoes. But Mount to Coast keeps giving me that “maybe this is the one” feeling. Stable, responsive, with just the right amount of bounce—these shoes make you want to keep going, even when the miles get rude.
Let’s not forget the heritage here. The Badwater name isn’t slapped on lightly—it’s a tribute to endurance, grit, and chasing finish lines that most people can’t even see. The R135 embodies that spirit with every damn step. Whether you’re dodging heat waves or just trying to get through a long grind, these shoes are ready to roll.
Bottom line? The R135 Badwater Edition isn’t just a worthy successor to the R1—it’s a glow-up. A transformation. A shoe that says, “You’ve leveled up. Let’s go show the road what that means.”
On the Steve Scale? Five out of five stars, because anything less would be disrespectful.
They look good and are super light. I broke these shoes in with a 17-mile run, and they felt amazing. No foot pain, no blisters, and my legs felt great. I'll be buying a pair of trail runners next.
My R135s arrived today, my first shoes from Mount to Coast but most likely the first of many. I only ran 5K but my pace was faster than expected and the shoes were comfortable. I have more shoes than Imelda Marcos yet my wife said these were the most stylish. I want to order another pair while they’re still available!
Wow! Big improvement. Noticeably lighter. Feels even more cushioned. Got a sweet spot just front of the heel. It even looks less clunky.
I already own a pair of R1s and S1s, but the R135s have definitely taken it up a notch. Broke them in on Saturday with a 10K through some rolling hills in 95 degree heat and their support had me gliding up steep inclines and cruising on straight aways. Looking forward to taking them out for some longer runs!
