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Giro Prolight SLX shoes



Lightweight shoes that are stiff and comfortable with a pro-level performance

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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Prolight SLX: with a name like that you can pretty much guess what Giro's top end road shoes are all about – lightness and a pro-level performance. At just 205g per shoe (size 42), the Prolight's are some of the lightest on the market thanks to a lack of mechanical closures, a smattering of titanium bling bits and an ultrathin Easton EC90SLX carbon sole.

At a glance, there doesn't seem to be much difference between these Prolights and the Factors we tested a little while ago. Look a little deeper, though, and you'll find all the little tweaks that shave off the extra 50g.

The road shoe market is a pretty busy place and with competition at this price point from the likes of Sidi and Shimano, Giro set about building a shoe from scratch. The first part of the process was to create the perfect last (the foot shape the shoe is built around). Sixteen versions were created before Giro were happy with the fit.

Once the shape of the last was sorted, it was time to start working on that all important sole. Luckily for Giro's designers, the carbon bods at Easton are part of the same parent company, so with the expertise in-house, work started on the Easton EC90SLX high modulus sole. Just 6.5mm thick, it brings your foot close to the action. All the hardware is titanium as opposed to the steel seen on the Factors. Along with the thinner, lighter sole, this results in a slight weight saving.

The uppers are made from Teijin microfiber: a sort of manmade leather. It's a one piece construction with an in-moulded heel cup minimising any irritation or rubbing from seams or joins. It's only 1.1mm thick but it looks to be pretty hardwearing and wipes clean. That's ideal if you go for the white ones. There are air holes on each panel for ventilation plus mesh sections to keep your tootsies cool in warm weather.

The biggest weight saving comes from the removal of the ratchet and buckle closure. It does look odd to see a £260 pair of shoes with just three Velcro straps holding them onto your foot, but it works. There is no loss of adjustment or security compared with a ratchet, it's just a bit more difficult to tweak the tension on the fly. The other reason for the lack of mechanical closure is down to Levi Leipheimer, who had a fair bit of input in the design. He didn't want to risk a broken ratchet after a crash in what could be a crucial part of a race.

The top two titanium strap buckles are offset to avoid pressure points on your instep. Having the buckles further over towards the outside of your foot does allow more of the upper to be pulled over the top, almost wrapping it around your foot.

Inside, the Easton sole is neutral, allowing for the use of the SuperNatural Fit Kit insole to custom fit them to any foot shape. Three varying arch profile inserts are included which Velcro to the base of the insole. The Prolights (like the Factors) allow the fitting of any orthotics that you already have set up in your current shoes.

Once on the bike, I found the fit spot on with the upper moulding to your foot shape after just a couple of rides. The stiffness from the sole is absorbed through the insole, and even when getting the power down there is enough shock absorption to keep things comfortable. The light weight really does make you feel like you aren't wearing any shoes at all (in a good way).

The sole is compatible with all cleats using the three bolt fixing system and there are measurement graphics to aid cleat change.

Overall, the Prolight SLX's are impressive with a good balance between comfort and stiffness. The finishing quality looks top notch as well. If you save them just for weekend jaunts into the country or racing, you should get plenty of seasons out of them.

With sizes ranging from 39-48 and half sizes from 39.5-46.5, most people will be able to get a good fit. The price is clearly high but the shoes, custom insoles and even a shoe bag all add together to make a decent package.


Lightweight shoes that are stiff and comfortable with a pro-level performance test report

Make and model: Giro Prolight SLX Cycling Shoes

Size tested: White - size 45

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

The Prolights are a pro-level shoe with light weight and performance to match,

Giro reckon,"The ultimate combination of power, weight and performance without compromise." Yep, that pretty much covers it

Tell us some more about the technical aspects of the product?

The Teijin material provides an instantly comfortable upper. It's very soft yet hardwearing.

Rate the product for quality of construction:

Looks very good quality with no rough edges.

Rate the product for performance:

Very light and the power transfer is top notch.

Rate the product for durability:

I wouldn't wear these shoes every day. I'd save them for special events and Sunday best.

Rate the product for weight, if applicable:

Some of the lightest shoes out there without compromising stiffness and power transfer.

Rate the product for comfort, if applicable:

Beautiful. That soft upper moulds to your foot as you put the miles in.

Rate the product for value:

They're not cheap but they're worth every penny.

Tell us how the product performed overall when used for its designed purpose

Great: stiff, light and comfortable.

Tell us what you particularly liked about the product

The fit and the look.

Tell us what you particularly disliked about the product

I preferred having the ratchet system on the Factors to be able to tweak the fit on the fly.

Did you enjoy using the product? Yes

Would you consider buying the product? I'd personally go for the Factors

Would you recommend the product to a friend? Yes

Overall rating: 9/10

About the tester

Age: 32  Height: 180cm  Weight: 78kg

I usually ride: Genesis Flyer  My best bike is: Ribble Gran Fondo

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed


As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for, and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

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dave atkinson | 12 years ago

My velcro straps on my 11-year-old Shimano touring shoes are still working fine. There's not a lot can go wrong with velcro.

bendertherobot | 12 years ago

 7 It's velcro. Tried and tested on, well, pretty much every bike shoe out there.

Are these expensive? Yes. Are they brilliant. No idea, but if they are better than the already unmatchable Giro Factor then great.

In my view Giro now make the best cycling shoes around. End of. The more expensive the better the materials. But, importantly, even the cheaper ones are built on the same design.

rodmc | 12 years ago

 39 velco straps.

Shimano MO76's had them for three years.

Use them for my daily commute (50km per day).

The velco straps are still going strong.

andybwhite | 12 years ago

And what Velcro straps do you know that have lasted more than say 6 months of regular use?
Having shelled out £260 I assume the buyer is actually going to try to get their money's worth so I don't reckon these are gonna last as long as one might want.

Pifko | 12 years ago

Road shoes are an investment. You buy a new pair, what, maybe every 10 years? Worth paying for a good pair.

andybwhite | 12 years ago

Wot! there's competition at this price point?
Have we lost out sense of perspective?
I didn't even know this price point existed - I can definitely think of better cycling related ways to spend £260.

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