For more than 20 years, Specialized’s Body Geometry has attempted to map the human anatomy and develop saddles that match it. But the development of foam structures as touchpoints had mostly hit a wall. So, they had to find something new. Enter, Mirror Technology.

Specialized’s announced Mirror Technology as a black box 3D printed liquid polymer technology  project in summer 2019 . The process, which they called “Digital Light Synthesis”, was to be the future of ergonomic bicycle saddle shaping. Here’s how it turned out…

Specialized 3D printed Mirror saddle tech explained

specialized power mirror 3D printed carbon fiber saddle

The name “Mirror” stems from the tech’s ability to reflect a rider’s anatomy to improve performance, increase comfort, and reduce the chance of injury.

Carbon fiber has changed the cycling industry in terms of what is possible with frame structures; low weight, tuned layups and more, whereas steel, titanium and aluminium are hindered by the properties and rules associated with metals. Mirror makes advancements in the same manner but moves away from foam cushioning.

Specialized announced it was leveraging Mirror technology to produce a 3D Printed Power Saddle, but initial testing was reserved for sponsored professional cyclists and teams, road and mountain.

The 3D printing process utilizes a patent-pending structure in the upper of the saddle, that can vary the density of the polymer material in ways that foam simply cannot replicate.

The resulting lattice structure, some 14,000 struts and 7,799 nodes, can be individually tuned to provide sit bone comfort for all genders. Specialized says they can back that up with science, and the design can also stabilize the pelvis and significantly dampen vibration.

3D printed carbon fiber foam in the specialized power mirror saddle

The centerline of the saddle features “mimic-like” tech with variable density windows that are impossible to create with foam. This saddle was never designed for gravel bikes, rather think of it is a performance-oriented saddle for all cycling disciplines.

Thankfully, pre-release testing of the saddle wasn’t reserved just for Specialized’s professional riders. We got to test it while riding the new Specialized Diverge with Future Shock 2.0 that launched in May.

S-Works Power Mirror saddle testing

2021 Specialized Diverge at media camp, Girona, Spain

Like so many products in cycling, saddles are a deeply personal choice. For that reason, I’ve mostly stuck with my preferred saddle of choice, the Fizik Arione saddle, one renowned for its racy shape, padding in the right places and good looks. Granted, the Arione is far from perfect, but those new and shorter styled “Power” saddles weren’t on my radar until a saddle manufacturer convinced me to try their design. More on that saddle in another review.

I’m glad I opened my eyes and mind to experimenting with some of the newer and shorter saddle designs on the market, circa 2019 / 2020.

The typical foam saddle places a lot of sit bone pressure in just one place. With Specialized’s Mirror tech, that same pressure is distributed over a much greater area.

Specialized didn’t get this right on the first attempt, it took 70 iterations created in less than a year, but always going from concept to a rideable sample in just one day. Such are the advantages of 3D printing technology.

specialized power mirror 3D printed carbon fiber saddle


Specialized’s high zoot pressure map testing demonstrated the benefits of Mirror versus the best foam tech, using the same rider and same apparel for each of their tests. Blind comfort studies followed later, which validated the findings of the pressure map testing.

“Light prints the lattice structure from liquid polymer, then a second chemical reaction occurs in a forced-circulation oven to strengthen and set the material’s final properties”.

But the saddle’s construction isn’t entirely a latticed structure / liquid polymer.

Rather, the end result 3D Printed upper structure is bonded to a carbon base and rails. Specialized believes the S-Works Power Mirror Saddle IS the most comfortable saddle they’ve ever made and tops everything made by other brands.

S-Works Power Mirror Saddle ride review

This fancy tech sounds fabulous on paper, but you can never tell how a new saddle is going to ride until the first planting of one’s arse atop the saddle. And later, around hour three into a six-hour ride. A high-quality pair of shorts will make a huge difference in saddle comfort, which explains why I was able to ride the original AX Lightness German-made saddle during those years before I found the Arione. Saddles weighing 68 grams tend to have their own set of issues, like cracking the fragile saddle rails.

Moving into 2019/20, I’m the first to admit I wasn’t a fan of cutout saddles. I tried the Arione VS with its channel cutout, presumably a repository for the male and female soft tissue anatomy. That saddle’s shape never felt good to me, the edges of the channel cutout rubbed me the wrong way. That saddle is relatively conservative looking compared to most of the modern, short and stubby saddles that until recently I thought were a bit silly.


Eventually, I came around, observing that saddle length isn’t the most important part of the equation. Rather, positioning the saddle’s “peak” area to deal with pressure distribution, positioning it in just the right spot beneath my sit bones.

S-Works Power Mirror Saddle actual weight & width

The S-Works Power Mirror Saddle weighs 192 grams, respectable for a saddle with this much cushioning. Non S-Works models, when (if) available, won’t get the full carbon shell and rails and likely weigh more.

Officially, the saddle measures 143mm at its widest point, but if you factor in the 3D printed cover overlap, you’re looking at about 148mm. Lengthwise, the saddle measures about 243mm nose to tail.

I spotted a camera mount at the Diverge launch that fit into those accessory mount bolt holes. No word if that will be a publicly available item, though.

It’s squishy to the touch and flexes easily with pressure, but not to the point of a hammock laden down with 70 kilograms of oranges. There is resistance to that squish, and the material pops back into shape as soon as the pressure goes away.

My first arse plant onto the S-Works Power Mirror Saddle at the Specialized Diverge camp felt entirely natural, no pressure points and even support for my sit bones across the entire structure, even when fidgeting about.

That camp was two days of amazing riding on the gravel roads of Girona, Spain, in early March, just before COVID-19 travel restrictions locked things down. I rode the S-Works Power Mirror Saddle for the duration of the camp, then packed and raced home to avoid quarantines.

specialized power mirror 3D printed carbon fiber saddle


Since then, the saddle has been at home on the Niner MCR 9 RDO full-suspension gravel bike, a machine I’m reviewing for Gravel Cyclist. To really put the saddle to the test of long-ride comfort, my first serious sojourn was a relatively unplanned 193-mile jaunt into the countryside of North Central Florida, way before anyone had thought of over-used hashtags to commemorate gravel cycling events that weren’t happening.

190+ miles / 300+ kms on a relatively new saddle, what could possibly go wrong?!

Somewhere in the middle of nowhere, North Florida

The good news is, nothing. I was more troubled by the incessant westbound headwind as I made my way towards the Florida state capital of Tallahassee. I wouldn’t make it to Tallahassee to finish my 400+ mile somewhat unplanned journey, and my soul was crushed. That journey will happen another time but on that day, I wisely U-turned and made haste for my USA home base of Gainesville, Florida.

You know what wasn’t crushed? My will to sit on the bike.

I don’t want to come across as paid shill, because I’m not, all of the reviews on this website and related entities are unpaid. Saddle reviews are difficult to quantify because what works for you, may not work for me. And vice versa.

My experience found the S-Works Power Mirror Saddle to be seriously comfortable, possibly the most comfortable saddle I’ve ridden in almost 30 years of cycling. Since then, I’ve continued logging miles atop the S-Works Power Mirror Saddle and Niner MCR 9 RDO, which when paired together, are the definition of next-level comfort for the gravelly road less traveled. The saddle was also pretty handy aboard the 2021 Specialized Diverge, a bike it was arguably made for.

Power Mirror Saddle pricing, and those creases…

There are some visual differences between the S-Works Power Mirror Saddle I rode at the Specialized camp in Girona, Spain, and the review sample I ended up taking home. Pictured above is the saddle from camp whilst below, the saddle I’ve been riding over the long haul.

You can clearly see there are some dimpled spots around the middle of my review sample. We’re not sure what happened with this one to cause the wrinkles, but it was delivered like this. Small visual differences aside, I noticed no difference in ride quality with my dimpled review sample.

Specialized assures us this is not how they come, and this post has been updated with more accurate photos of a saddle other than my own. Tyler’s getting one in for long term review, too, and we’ll compare notes after several more months of riding.

Is this saddle for you? It could be. Pricing is steep at $450 USD, but can you put a price on long-term comfort?

Article by Gravel Cyclist. Jayson O’Mahoney is the Gravel Cyclist: A website about the Gravel Cycling Experience.


  1. Eli on

    Those creases in the middle of the saddle seem like that could have long term durability issues as it might break at the crease. Plus the grid in the cutout area seems distorted. Local bike shop is charging $450 for it so think I’ll wait and see how durable it is long term

    Might qualify for their 30 day return policy so may not be that risky for seeing if it fits:

  2. typevertigo on

    Interesting review. The Mirror’s better spot-cushioning might resolve my one major complaint with the original Power saddle: its overall sloping shape, combined with the relatively firm foam, meant that it slowly dumped me on its unyielding nose on long rides. I had the entry-level Comp model, which I understand was one of the more cushy variants.

    • -s on

      I have a Comp too. It is great on a mountain bike, but I cannot get it to work on my road bike. It is just not comfortable for long seated road rides. I use a ISM Podium currently.

      • typevertigo on

        Yeah, it takes quite a bit of fiddling around to dial in the position on a Power, from my experience. The short length would have been better had it been paired with a flatter, less severe angle along its profile.

        I ended up going back to Selle SMP, as the wavy profile on their saddles helps you stay planted in one position.

  3. alex on

    So here we have the ultimate opportunity to leverage carbon fiber and 3D printing to fully customize saddles to the rider. Instead we get a $450 one-size-fits-most solution. Total missed opportunity to do something really innovative that leverages the best of these technologies. People would send $450 for a custom saddle.

    • Tom on

      small steps. First, you have to understand how a system works, objectively, before you can design to suit a particular individual. All evidence so far says that saddle fit and comfort is very subjective. With this new technology, there is potential to start collecting more data and understanding things better.

      • Zachary A von Szeremy on

        They already have plans to do fully custom, made/fit to order saddles in the future. This is just step 1 on that journey. I bought the Mirror and personally cannot wait to get my arse planted on it!

  4. supercurrymax on

    I’ve got nerve damage issues to pudendal nerve that precluded me from riding for several years but I found a seat called the spongy wonder that has allowed me to cycle again. It’s not sexy but it works. Anyone know if this mirror saddle would be able to replace that?

  5. Mic on

    I’ve just received a new selle italia kit carbonio boost (wide) version saddle update for 2020, wondering if I should keep it and mount it or return it and try this one… hmm… $150 US difference but for the right saddle I’d pay a kings ransom. Older kit carbonio was my go to but as I’ve aged and the saddle shave worn down I’m wondering if my body wouldn’t be happier on something more plush

  6. Steve Morganstern on

    I would like to hear your thoughts on comparison to the Fizik Versus Evo that uses this same technology.

  7. Zachary A von Szeremy on

    They already have plans to do fully custom, made/fit to order saddles in the future. This is just step 1 on that journey. I bought the Mirror and personally cannot wait to get my arse planted on it!

  8. Ivan on

    So, after all is said and done: I can use this new saddle to have better comfort on 150+ mile rides than my ISM Adamo (that has a cut-out)? I’m 5′ 7″ 170 lbs, muscular. What size do I get?


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