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Giro Prolight SLX Shoes

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Item # GIR0274 Past Season Colors

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Item # GIR0274

410 grams. For the pair.

With one quick look at the Giro Prolight SLX Shoes, you'll know something is different. There are no mechanical closures, a rarity among pro-level shoes. This is in response to the needs of their marquee rider, Levi Leipheimer. Being meticulous about his gear, he wanted Velcro closures rather than a buckle so he could be confident that the shoes would survive a crash; buckles can break and having one go in a Grand Tour is a lousy way to lose a race you prepared all year for.

Velcro, great. Simple, adjustable, conforms well to the foot, hard to break: everyone can get into that. But Giro didn't just drape three straps across the top of the shoe. They designed each strap to do something a bit different, so each is angled slightly differently. The top strap holds the heel into the cup, the middle strap goes across the metatarsals to anchor your foot in the shoe, and the bottom strap takes up any loose space in the forefoot. If you take a close look at the medial side of the shoe, you'll see that each strap is fixed on large swaths of material, meaning that you're pulling the entire upper over your foot, rather than creating pressure points under each strap. Another subtle but striking feature is the way the toe box is constructed. One-piece toes look great, but the smooth look often comes at the price of limited adjustability. On the Prolight, the toe area looks conventional, but it allows for a wide range of adjustment on that bottom strap and eliminates the dreaded pucker, even if you have a narrow forefoot.

And, because every gram counts when you're climbing 15,000 feet a day, several days in a row, Leipheimer also wanted the lightest possible shoe without losing either stiffness or security. This Easton EC90SLX is the lightest and stiffest sole Giro uses in their Giro Prolight SLX Shoes  Detailshoes. Easton and Giro are divisions of the same company and Giro leaned on Easton engineers here. The result is a super-stiff sole that's only 6.5mm thick over the pedal, and thanks to the lay-up and titanium bits, it's super-light. Each sole is weighed after being molded. If it weighs too much, it's rejected. That means the sole in a size 42 has to weigh within three grams of the target 60g. 63.1g and the sole isn't built into a Prolight SLX.

Every part of the Prolight shoe gets this kind of scrutiny. The upper is soft, super-thin Teijin AG100 ultra-light microfiber that Giro worked with Teijin to develop. It's only 1.1mm thick, allowing it to conform easily to your feet, but it also doesn't stretch, thanks to an ultra-thin internal webbing that's bonded behind the microfiber exterior. The shoes would miss the mark if they weren't breathable, and though it has a smooth finish, it breathes well enough to stay comfortable on summer days. Inside the shoe, there are very few seams, and a layer of polyester liner material eliminates any possibility of chafing.

The tongue is generously-padded, with equally generous perforations in both the foam and the Teijin covering to make sure your foot breathes. The top of the tongue is notched so your tendon doesn't find any resistance through your pedal stroke. Fit tip: when putting on the shoes, align the split in the tongue with your tendons.

Continuing their pursuit of super-lightweight race shoe, the D-rings that you use to pull the straps are made of titanium. The overall weight of a size 42 shoe is 205g, among the lightest on the market.

As we wrote above, the shoe looks different. Another difference is that there seems to be very little architecture going on around the heel. This is by design. Looking at the increasingly-complicated heel cups on some of the competition, Giro decided they'd rather the shoe fit well everywhere and that careful construction and quality control would produce the desired fit and consistent dimensions in every shoe.

Another benefit of a less-constructed heel cup is that there is more room for inserting after-market insoles. Giro includes two sets of insoles with the Prolight SLX -- an ultra-thin, ultra-light EPP footbed for people who want to keep weight to a minimum and don't need support, and their SuperNatural Fit Kit for those who need arch support. If you don't know which kind your foot prefers, try both. But, back to the point of the simpler construction, this upper is designed with the idea that people might well use a custom insole. To this end, they rejected the "bathtub" style sole, the ones that curl up on the sides, and went with a flat, neutral sole that would better accommodate different insoles and a larger range of foot widths.

Giro's SuperNatural Fit Kit is Giro's aftermarket insole solution. They made them as thin as possible at the heel and ball of the feet so you don't feel like you're foot is being lifted out of the shoe by the insole. The base material is EVA foam, so you'll crush the insole where your foot pushes against it, or "set" it if you want to get technical, over the course of several rides. The top is finished with a thin layer of X-Static material for its wicking and anti-microbial qualities. But what makes the SuperNatural Fit Kit a big deal is that the insoles come with three different height arches that allow you to customize the arch fit.

The Giro Prolight SLX comes in two colors -- Black and White. They're available in whole sizes from 39-48 and half sizes from 39.5 to 46.5. The sole is drilled for three-bolt cleats. There are pads underneath both the heel and toe for walking on slick surfaces. A travel bag is included with the shoes.

  • 6.5-millimeter thick carbon sole offers a low stack height for optimum comfort and power transfer
  • EC90 carbon is of the same quality as Easton's wheels
  • Toe and heel rubber makes coffee shop walking slightly less treacherous

Tech Specs

Upper Material:
Teijin AG100 microfiber
Cleat Compatibility:
3-hole road
EC90 SLX carbon fiber
EPP with X-static
Claimed Weight:
410 g
Recommended Use:
cycling, racing
Manufacturer Warranty:
1 year

Size chart


Cycling Shoes
36 4 5 3 22.5
37 5 6 4 23.5
37.5 5.5 6.5 4.5 24
38 6 7 5 24
38.5 6 7 5 24.5
39 6.5 7.5 5.5 25
39.5 7 8 6 25.5
40 7.5 8.5 6.5 25.5
40.5 8 9 7 26
41 8 9 7 26
41.5 8.5 9.5 7.5 26.5
42 9 10 8 27
42.5 9.5 10.5 8.5 27
43 9.5 10.5 8.5 27.5
43.5 10 11 9 28
44 10.5 11.5 9.5 28.5
44.5 11 12 10 28.5
45 11 12 10 29
45.5 11.5 12.5 10.5 29
46 12 13 11 29.5
46.5 12.5 13.5 11.5 30
47 13 14 12 30
48 13.5 14.5 12.5 31

Reviews & Community


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Simply the most comfortable cycling shoe

  • Familiarity: I've put it through the wringer

Simply the most comfortable cycling shoe I've ever owned, and I've owned plenty. I've gone through countless Sidi's, but the fit and light weight of the Prolight SLX takes the prize. The toe box is perfect (for me). I'm not sure how well they'll hold up though...we shall see.

Great shoes! Deja vu

  • Familiarity: I've used it once or twice and have initial impressions

Just like Colarado Chris I take a size 42 in Sidi and got a 42 in black for these. When I took them out of the box they actually looked smaller but putting them on they fit perfectly, if not just touch wider than my Sidi's. So the size chart was accurate for me. The multiple inserts make finding the right comfort and arch support an adventure but hey, better to have more options than none. Quality of the shoe is great and they are very, very light. I think I prefer the Sidi Techno 3 closure system for an overall better fit but the velcro system does the job well. Only used them a couple of times so far so can't offer any comments on durability yet. Black will probably maintain a little better than white though.

Avg. ride time: 15m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Lightweight! Perfect fit! lots of scuff.

    I have 42 size shoe. I have worn only Sidi for last 20 years. Tried other brands from time to time but never felt right; either to thick, too wide, too narrow, poor quality, etc. I thought Sidi were the best but after trying on Giro I don't think I will go back. First is the weight. WOW! I have never had a shoe this light and it really does make a difference. I felt like I could spin up faster almost instantly with the giro's. I am using Look Keo's. Second thing you will notice is that you will have to drop your seat post height if your running Sidi's. The stack height on the Giro is much shorter. I didn't really think it would make a difference but after one ride it was VERY noticeable. The first pair of Giros I had to send back to CC (they took them back without any problems) because of manufactures defect; one of the straps had the velcro in the wrong place and you couldn't get the strap to stay in place. Second pair I got were perfect. I wear Sidi 42 and also Giro 42 without problems. The inserts that come with shoe help in fitting the shoe based on your foot. Only problem I have is the toe material is very easily scuffed. Yes, its white but one rub on your front tire and it will have a permanent mark. Sidi was more durable in this toe area but again its just cosmetics. I don't see any tears in the material. Comfy feel to toe box and rest of shoe. No hot spots in the sole. I am not using any special soles. Just what came with the shoes.

    get them for the drop in weight alone!

    Lightweight! Perfect fit! lots of scuff.

    I recently bought a pair of these shoes...

    I recently bought a pair of these shoes but noticed that the screws on my Look Keos were too long for the thin sole.

    Where can I get screws that are short enough for these shoes?


    The look Keo comes with 10mm screws which are pretty short and work on low stack height shoes pretty well. If there are still too long try a thin washer from the hardware store, maybe find some old screws off a SPD or Crank Brothers cleat. You can find 8MM screws which will solve your problem but may be too short. Usually your local bike shop has a box of cleat screws you can try. or try these

    Write your question here...I have a wide...

    Write your question here...I have a wide foot and high arches that need support. Will this shoe work for me?

    I have the same foot shape (high arch, wide, with a standard width heel). I found the Giro shoe to be quite narrow and similar feel to Mavic. If you are looking for a wider shoe try Northwave I have had great success with them.

    Unanswered Question

    I?m not sure about sizing. I use Mavic...

    I´m not sure about sizing.
    I use Mavic Zxellium (VERY nice shoes) in 8.5
    ¿In giro what is the equivalent size?

    I have a wide foot with a very high instep....

    I have a wide foot with a very high instep. would this shoe work for me? can I return for for refund if I feel it doesn't work for me?

    It is not a wide specific shoe so it may be a bit tight for you. As far as the return policy goes, you have 60 days from the time of receipt to return the shoes for a full refund if they don't work for you.

    I am having persistent Achilles tendonitis...

    I am having persistent Achilles tendonitis in my heel after riding. Are these shoes comfortable in the heel portion?

    That only happens when your cleats are set too far forward toward your toes and your saddle height is too high. This is forcing you to keep your calf muscles in tension almost constantly, causing the achilles to get irritated from overuse trying to stabilize your foot. It isn't the shoes!

    achillies heal problems can be caused if you like to drop your heal on the down stroke. If this is the case, raise your seat a little bit so that you limit the range of travel of the heal (below the front of your foot)

    Avg. ride time: 11h 9m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Could be the perfect shoe

      For shoes I value lightness, stiffness, and a no fuss fitting system. These shoes equal or exceed all other shoes I have owned on the first two criteria (comparing with S-works, Octanes, and LGs ultralights). When it comes to fit this will be personal, but for me these are the most comfortable shoes I have owned, three quick velcro straps are secure with no pressure points. Definitely will be buying a second pair.

      How do these fit size wise compared to the S-Works shoes?


      Unanswered Question

      What is the toe-box width of a 44.5 Giro...

      What is the toe-box width of a 44.5 Giro Prolight SLX shoe?