Hey there, Alastair from Trail and Kale Running Co. here, back with a fresh new running shoe review. This time, it’s all about the Mount To Coast S1, a daily trainer designed for long, slow runs – yes ultra runners, this one is for you!
As someone who loves every kind of running, and reviewing the latest gear to makes it all possible, I’m excited to share my thoughts on this shoe, because it’s a fairly niche running shoe but extremely well tailored to ultra running. Whether you’re a marathoner in training or someone looking for a reliable recovery run shoe, stick around because this Mount To Coast S1 review is packed with insights that will help you decide whether or not they may be a good fit for you.
➡ To learn about Mount To Coast’s other running shoes, the R1 and P1, read my ‘Best Mount To Coast Shoes‘ roundup next.
Key specifications of the Mount To Coast S1
- Price: $150 at mounttocoast.com
- Weight: 9.3 oz (264g) for a size US Men’s 9 [my pair]
- Heel-to-Toe Drop: 10mm
- Stack Height: 36 mm (heel), 26 mm (toe)
- Upper Material: Dual-layer jacquard mesh (100% recycled yarns), reflective highlights, rear finger loop, gusseted tongue
- Midsole: cushioned yet responsive PEBA-based nitrogen-infused Light Cell Foam with Go Flow technology with strategically placed zero-sag foam
- Outsole: Flexible with a rubber compound that has good grip
- Stability: Moderate/Neutral
Use our exclusive code ‘#TRAILKALE8‘ for 8% off your order at mounttocoast.com.
Fit and feel
Right out of the box, the Mount To Coast S1 fits true to size with a medium width. Unlike its ultra race day sibling, the Mount To Coast R1, the S1 has a more snug toe box. This might be a downside if you prefer a roomier fit, but for me, it felt just about ok.
The dual-layer jacquard mesh upper is both soft and durable, providing a comfortable wrap around the foot and I prefer the tradition lacing system to the dual setup on the R1. The gusseted tongue adds to the secure fit, and the cushioned collar and heel counter enhance the overall comfort.
Mount To Coast S1 performance review
Before i get stuck into how they perform on the run, here’s a quick reminder that you can also watch my video review to get more insights, just tap on the image below – Don’t forget to give the video a like if you enjoy it (that really helps our channel), and subscribe to our Youtube Channel for more reviews of the latest running shoes :).
Slipping on the S1 for the first time, the first thing that struck me was the comfort. The midsole cushioning is noticeable without being too plush, and the fit is snug but not restrictive.
There’s plenty of cushioning around the collar/heel counter and the high 10mm drop from heel to toe, although higher than I usually prefer (as most of my running is at a faster pace, where a forefoot landing is more natural), doesn’t feel too high on the run.
This allows for a natural stride while still providing cushioning for those who heel strike when they’re running at slower paces during ultra marathon training.
The Mount To Coast S1 is a shoe that performs its best during long, slower runs. Designed for paces between 8 and 14 minutes per mile (or 5 to 9 minutes per kilometer), it’s built to handle the demands of marathon training and recovery runs where more steps are taken with more downward for and compression hitting the midsole.
The LightCell foam in the midsole is both responsive and cushioned, providing a comfortable ride even over extended distances.
The GoFlow technology strategically places varying types of foam to enhance energy return and durability, particularly in high-pressure areas like the forefoot. This particular high pressure area foam is called ZeroSag and it is designed so that the energy return last for longer than traditional foams, hence the name ZeroSag.
Despite being advertised as a moderate/neutral stability shoe, the S1 feels quite stable on my runs. The midsole’s zero-sag foam in the forefoot and the solid heel cage work together to minimize pronation and maintain a stable gait.
This stability is SO important for long-distance runs, where form can waver as fatigue sets in.
The outsole’s flexibility also deserves a mention. It’s designed with break lines (in the white GoFlow section seen below) that allow for a natural flex, making strides feel easy with less push back that you may expect from a stiff midsole/outsole combo.
The traction is also solid, with gullies that help in wet conditions, reducing the risk of slipping.
Comfort is a major highlight of the S1 – the dual-layer jacquard mesh upper, cushioned collar, and heel counter create a plush, comfortable environment for the foot to work in.
However, in very hot conditions, breathability has been an issue for me. The S1 doesn’t ventilate as well as the R1, making it less ideal for anyone running in warm climates.
But for cooler temperatures or shoulder seasons, this reduced breathability can actually help keep your feet warm – silver linings and all that jazz!
The durable midsole foam’s design ensures long-lasting energy return, and the outsole can withstand the wear and tear of regular use. The overall build quality suggests that the S1 can handle many miles before showing signs of significant wear too, and so far it’s holding up very well.
Is the Mount To Coast S1 Worth Buying?
For $150, the Mount To Coast S1 offers excellent value. It’s a fantastic daily trainer, particularly suited for long, slow runs and recovery sessions. If you need a shoe for this type of running I recommend you go and buy yourself a pair at mounttocoast.com.
The combination of comfort, cushioning, and stability makes it a reliable option for marathon training or any long-distance endeavors. While its breathability may be a concern in hot climates, it’s a minor trade-off for the overall performance and durability the shoe offers.
If you’re looking for a shoe better suited to road ultra racing, go for the R1, but for your road ultra training, the S1 is the better choice.
Use our exclusive code ‘#TRAILKALE8‘ for 8% off your order at mounttocoast.com.
The Best Alternatives Right Now
If the Mount To Coast S1 doesn’t quite fit your needs, there are several great alternatives to consider. Check out our Best Daily Trainers, Best Max Cushion Running Shoes, and Best Stability Running Shoes roundups for more options.
