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Giro Prolight SLX II Shoes

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Item # GIR003D Past Season Colors

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Item # GIR003D

For the big races.

It wasn’t so long ago that Giro made helmets — and just helmets. In the past few years, though, Giro shoes have become a mainstay at just about every race, from Grand Tours to outlaw CX races. The Prolight SLX II Shoes you see here lean toward that Grand Tour category. In addition to being incredibly light (just 410g per pair), they’re also designed with the needs of the big-race rider in mind. Rather than adorn these shoes with the latest micro-adjusting buckle or cable retention system, Giro opted for the hook-and-loop strap. Why? Because crashes can break buckles, and if you need to chase back to the peloton, it’s going to be a lot harder with a loose shoe.

Underneath the microfiber uppers is Giro’s EC90 SLX ACC sole. In addition to being phenomenally stiff, it also boasts a low, 6.5mm stack height, which ultimately means less material between the shoe and the pedal to rob you of watts. Included in this package, as well, is Giro’s SuperNatural Fit Kit, which likely needs no introduction. An insole system that includes three different arch height inserts, these are the key to getting the best fit out of any shoe we try.

  • EC90 SLX ACC sole
  • Microfiber upper
  • Hook-and-loop strap closure
  • 3-hole cleat compatibility
  • SuperNatural Fit Kit included
  • 6.5mm stack height

Tech Specs

Upper Material:
[upper] Evofiber
Closure:
3 hook-and-loop straps
Footbed:
Ultralight SuperNatural Fit Kit
Sole:
Easton EC90 ACC carbon fiber
Cleat Compatibility:
3-hole road
Claimed Weight:
[size 42.5] 205 g
Recommended Use:
cycling
Manufacturer Warranty:
1 year

Size chart

Giro

Cycling Shoes
EUUS MENUS WOMENUKCM
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

REVIEWS

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No More Sidi's!

  • Fit: Runs large
  • Size Bought: 42

I have been a long time Sidi rider. This summer I forgot my shoes on a trip and purchased the Giro Trans E70 Road shoe (what was available at a local bike shop). As soon as I put them on I knew I had been missing something from just using Sidi. The shoes were comfortable and the Easton carbon sole was amazing. After awhile though I felt my impulse purchase was not great because the shoe was just a tad large. I always needed to use a thicker sock to make a snug fit. CS had a sale on the much higher end and lighter version Prolight SLX II. I purchased the smaller size and the fit and amazing weight advantages of this shoe has converted me. Giro is the way to go. The shoes weigh next to nothing. Even the best Sidi's I owned paled in comparison to the weight. The fit - well it is all subjective - but I have to say the Giro foot bed feels more crafted for my feet. Try these shoes - you will not be disappointed.

Not under or overwhelmed, just whelmed.

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: 41.5

I put thousands of miles into my previous pair of Prolight SLX IIs. After trying to decide which shoe to get next, I decided to get the same shoe in a different colorway. I put in the same custom footbed, and my feet have been in agony ever since. I can't explain it. My previous pair fit like a glove, no copmalints. Same shoe, same size, but I'm not sure if I can continue riding in this new pair. :(

Avg. ride time: 23m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Good Training Shoe

  • Familiarity: I've put it through the wringer
  • Fit: Runs large
  • Size Bought: 46

I picked these up a few months ago to wear regularly for my commutes and training rides. The shoe fit is pretty good, but it is a little loose in the heel. I happened to get them in orange. Be warned, the color is bright which worked out well for commuting; otherwise it's hideous and you might want to avoid it. Mechanics wise the shoe closures are ok and stay put on the rainiest NW rides. The velcro does feel a bit childish and I think laces would help the shoe fit. The shoe uppers are made of this strange plastic feeling material; possibly some coated leather. It does not feel supple at all and is probably one of the reasons the shoe feels so boxy. The outsole is crazy stiff as promised. No complaints there. Also the shoes do not have a lot of venting so they've tended to stay warmer over the winter months. I do worry that the summer will be a problem.

Overall its a good shoe, just not great. I got them during one of the blowout sales so it was justifiable. Next time I will look for shoes with more supple uppers.

Cool but not Awesome

  • Familiarity: I returned this product before using it
  • Fit: True to size

I was looking for a really awesome shoe and while this ones were a great deal I wasnt too happy with the looks. They are cool but not awesome. Also I made a mistake and order smaller size than what I need it

Avg. ride time: 28m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Yep Retinal searing orange!

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: 42

I wanted a bright shoe and boy these do not disappoint. They are orange but then giro turns up the volume to 10 orange as they almost glow in the dark. I have a 8.5 foot; 42 fit perfectly. I had older SLX and loved them also. Getting hit by car now makes me want to be more "visible". Ventilation is great. No hot spots. Lighter than any sidi. I rode sidi for over 15 yrs; once I tried giro shoes I've never went back to the higher stack/heavier sidi's. Just make sure you like orange.

Avg. ride time: 4h 16m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Very nice shoe at a great price

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: 45 (Usually wear a 44

We've recently put this shoe through it's paces and really enjoy it! Here's our initial video review with a post-ride follow-on video coming soon!

Thanks T.C. & B. Tell Boogeyman, "dude, your laugh is like the best laugh ever, like, in all of history." A dad thing. GTK how much these run small and how freaky bright but they might just work with an Orbea "Euskaltel" tribute build. Not into dog-leash-long straps as you say - have they calmed down or did you modify?

Excellent review. I have the same question as Eric: What's up with the straps? For me, that overhang is a deal breaker.

Thanks guys. The straps have somewhat tamed down. Let's just say, I don't even think about them now. I've really grown to love these shoes. I'll likely be posting a follow-up review now that I've put a few hundred miles on them.

Wow. The photo of the shoe, in white, shows no dangling excessive strap length that the video clearly shows. I credit the maker of this video for alerting to this matter as that much strap IS a deal breaker here. Well done on your product review video. On second thought, I'll check with my rep at Comp. Cy. (the very helpful Brock) before I write this shoe off.

Sooooo comfortable

  • Familiarity: I've used it several times
  • Fit: True to size

These shoes are super stiff and light but IMO the reason they are so great are the uppers. Uppers are perfectly constructed with no pressure points or hot spots like I've found with other closure systems.

Avg. ride time: 0m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Easy on and off

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: 44.5

So I bought these shoes to wear in my first half ironman because they looked like I could get then on and off fast with just the straps and not having any wheel to turn. This is exactly why they are working out great so far. I bought size 44.5 and I usually wear a size 11 running shoe and the fit is pretty much right on and maybe just a little big if anything. On one ride I got tons of my energy drink on them and I don't recall my feet ever getting wet and they wiped off easily with just a wet paper towel. They are very comfortable but feel stiff enough for my average riding style.

Awesome Shoes

  • Familiarity: I've put it through the wringer

I don’t need a lot of room in the toe box. For me an average toe box is ok. This shoes fit me perfectly. I replaced the footbeds with a Specialized Body Geometry SL Green for more arch support—I may go for custom footbeds down the road.
Super light—the weight, or lack of it, is insane. Very comfortable, breath well and no more hot spots--that I had with my previous shoes (Shimano). I like the Velcro approach, it is well adjustable and the shoes are stable on the foot without causing pressure.
All in all I am very pleased.

Speedy traffic cones

  • Familiarity: I gave it as a gift but have feedback to share

I bought these for the hubs. Here’s his review:

With Sidi’s shoe line-up trending ever more progressively out of my pocket book and with increasingly hulked-out styling, I welcomed a change to Giro’s more appealing aesthetics. The Prolight SLX 2 came in a zippered, mesh carrying bag (which just so happens to be terrific for toting HR straps, glasses, and some energy bars in a pinch). I ordered the Orange/Black version, which leapt out at me brilliantly and immediately begging to catch some sunrays. The construction is exceptional. Extremely smooth lines, seamless pairing of leather and carbon sole, perfectly placed venting systems, and Velcro straps that maintain grip while laying nearly flat in uniformity with the shoe’s body. And OH SO lightweight. If your goal is reducing weight, these guys won’t hold you back.

Once on, I did notice differences in the fitting. I had to go down half a size from Sidi to have the correct fitting. And the Prolight feels more like a sleeve that you put your foot into, whereas, the Sidi feels more like a snug, race-ready pocket. All that goes away though once you spend 20 minutes in the Prolights. No movement, lots of breathing, no hot spots…The only adjustment I had to make was inserting Specialized soles into the Prolights to give my feet a bit more elevation. The lateral ankle cups are set noticeably higher and, at first, dug into my malleoli.

On the bike I don’t even notice them on…save for the extra amount of venting and airflow. An added bonus is that I have noticed drivers provide me much more personal space and considerations on the road. The “near-miss” ratio has definitely improved. I guess sporting badass traffic cones on my feet means my life is worth more now.

These shoes are here to stay. Very happy with the purchase and the more minimalistic approach Giro has to their line-up.

Not a full review

  • Familiarity: I returned this product before using it
  • Fit: Runs small
  • Size Bought: 43 and 43.5

I have used and currently ride with specialized s works road shoes.
These appealed to me because they don't rely on BOA closure system. I've had the BOA's fail and need replacing. The Giro velcro system is more bombproof so I thought I'd make the switch. I am a size 9- 10 shoe depending on make/model Euro size 43 in specialized. Both the Giro 43 and 43.5 were too narrow.
Otherwise the styling, construction and weight of the shoe are awesome. Be careful. if you like a roomy toe box, these may not work for you.

Avg. ride time: 8h 17m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Apprehensive at first, but a loyalist

  • Familiarity: I've put it through the wringer

I was very apprehensive of going back to three velcro straps after years in shimano and sidi buckles. But I was VERY surprised at the lightweight of the shoes. It doesn't take long to be totally convinced that the three strap design Giro utilizes stays snug and is more adjustable than buckles and straps. It also doesn't have that awkward "hug" or compression feeling of boa. All in all i'm very satisfied with the weight and comfort.