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 shoes. 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
Teijin AG100 microfiber
EC90 SLX carbon fiber
EPP with X-static
39.5 - 40
41.5 - 42
44 - 44.5
46.5 - 47
47 - 48
Terms And Conditions
This Usage Agreement (the "Agreement") governs your conduct while using various services on the web site Competitive Cyclist and its affiliate web sites (collectively, the "Site"). All references to "we," "us," and "our" shall mean Competitive Cyclist and all references to "you" and "your" shall mean the user of the Site and Site Services. This Agreement applies to various services and activities on the Site as well as to gear review and product ratings (collectively, "Site Services"). Please read this Agreement carefully.
BY ACCESSING, BROWSING, AND USING THE SITE, ANY SITE SERVICES AND OTHER SERVICES THEREIN, YOU AGREE TO BE BOUND BY THIS AGREEMENT AND ITS TERMS. IF YOU DO NOT AGREE TO THIS AGREEMENT OR ANY SUBSEQUENT MODIFICATION THEREOF, DO NOT ACCESS, BROWSE OR OTHERWISE USE THE SITE OR SITE SERVICES, INCLUDING THE SUBMISSION OF ANY REVIEWS OR COMMENTS.
Any comments, reviews (including gear reviews and product ratings), posts, feedback, questions, answers, notes, messages, images, video, audio, materials, documents, data, graphics, ideas, suggestions or other communications (collectively, "User Content") you submit on the Site are not private or proprietary. By submitting User Content on or through the Site, you grant, assign and transfer to Competitive Cyclist all of your rights, title and interest, including without limitation, all intellectual property rights and moral rights, in and to such User Content. To the extent the preceding assignment and transfer is ineffective, you hereby grant Competitive Cyclist an irrevocable, royalty-free, worldwide, perpetual right and license to use, copy, modify, adapt, display, publish, archive, store, distribute, reproduce and create derivative works based upon such User Content, in any form, media, software or technology of any kind now existing or developed in the future.
By submitting such User Content on or through the Site, you are confirming that (a) you are the sole author of the User Content and the User Content originated with you and not copied in whole or in part from any other work; (b) you have obtained all necessary permissions associated with the User Content, including without limitation permissions relating to copyrights, trademarks, rights of publicity and/or rights of privacy; (c) the User Content does not contain hate speech or profanity and is not unlawful, threatening, abusive, harassing, tortuous, defamatory, vulgar, libelous, obscene, racially, ethnically or otherwise objectionable, an invasion of another's privacy, or otherwise in violation of this Agreement; (d) that you are not a minor and have the legal right and capacity to enter into and comply with this Agreement; (e) such User Content does not and will not, in any way, violate or breach any of the terms of this Agreement; and (f) Competitive Cyclist shall not in any circumstances be required to pay or incur any sums to any person or entity as a result of its use or exploitation of the User Content.
With respect to your conduct on the Site or while using the Site Services, you agree not to: (a) attempt to disguise the origin of any User Content transmitted to the Site Services whether through the Site or any third party site; (b) act in any manner that negatively affects other users' ability to use the Site and Site Services; (c) impersonate any person or entity, including without limitation, a manufacturer or owner of any product, or falsely state or otherwise misrepresent your affiliation with a person or entity; (d) interfere with the Site or Site Services, or servers or networks connected to the Site or Site Services, or disobey any requirements, procedures, policies, or regulations of networks connected to the Site or Site Services; (e) upload, post, or otherwise transmit any User Content that with respect to the Site Services: (i) is not relevant to the product, service, person or entity being reviewed; (ii) you do not have a right to transmit under any law or under contractual or fiduciary relationships (by way of example but not limitation, inside information, proprietary and confidential information learned or disclosed as part of employment relationships or under nondisclosure agreements); (iii) contains software viruses or any other computer code, files or programs designed to interrupt, destroy or limit the functionality of any computer software or hardware or telecommunications equipment; or (iv) is unsolicited or unauthorized advertising, promotional materials, "junk mail," "spam," "chain letters," "pyramid schemes," or any other form of solicitation.
User Content does not reflect the views of Competitive Cyclist, and Competitive Cyclist does not represent or guarantee the truthfulness, accuracy, completeness, timeliness, integrity, quality or reliability of any User Content, nor does Competitive Cyclist endorse or support any opinions expressed in any User Content. In no event shall Competitive Cyclist have or be construed to have any responsibility or liability for or in connection with any User Content, Any gear reviews and/or product ratings submitted on the Site, if displayed, are displayed for entertainment and informational purposes only. Under no circumstances will Competitive Cyclist be liable in any way for any User Content, including but not limited to, any errors or omissions in any User Content, or for any loss or damage of any kind incurred as a result of the use of any User Content posted, emailed or otherwise transmitted via the Site or Site Services.
If Competitive Cyclist determines, in our sole and absolute discretion, that you or any User Content you submit violates this Agreement, we reserve the right, at any time, without notice and without limiting any and all other rights Competitive Cyclist may have under this Agreement, to: (a) refuse to allow you to submit further User Content; (b) remove and delete your User Content; (c) revoke your registration and right to use the User Content Submission Features; and (d) use any technological, legal, operational or other means available to enforce the terms of this Agreement, including, without limitation, blocking specific IP addresses or deactivating your registration, access to the Site and Site Services using your e-mail address, and your user name and password. Without limiting the foregoing, once User Content is submitted to the Site, Competitive Cyclist may take any or no action with respect to such User Content, including without limitation, deleting, editing, modifying, rejecting, or refusing to post such User Content, but is under no obligation to offer you the opportunity to edit, delete or otherwise modify User Content once it has been submitted. Competitive Cyclist shall have no duty to attribute authorship of User Content to you and shall not be obligated to enforce any form of attribution by third parties.
If, despite the foregoing assignment and transfer of rights in the User Content, it is determined that you retain moral rights (including the rights of attribution or integrity) in the User Content, you hereby declare that: (a) you do not require that any personally identifying information be used in connection with the User Content or any derivative works of or upgrades or updates thereto; (b) you have no objection to the publication, use, modification, deletion and exploitation of the User Content by Competitive Cyclist or its licensees, successors or assigns; (c) you forever waive and agree not to claim or assert any entitlement to any and all moral rights of an author in any of the User Content; and (d) you forever release Competitive Cyclist, and its licensees, successors and assigns from any claims that you could otherwise assert against Competitive Cyclist by virtue of any such moral rights.
You are prohibited from violating the security of any system or network compromising the Site or the Site Services, including but not limited to the following: (a) unauthorized access to or use of data, systems, or networks, including any attempt to probe, scan or test the vulnerability of the Site or Site Services or to breach security or authentication measures; (b) unauthorized monitoring of data or traffic on the Site or of the Site Services; (c) interference with the Site or Site Services including without limitation, any type of flooding technique or deliberate attempt to overload the system such as denial or service attacks; (d) forging of a message header or any part of a message header; or (e) using manual or electronic means to avoid any use or access limitation placed on this Site or the Site Services. Such violations may result in criminal or civil liability.
Competitive Cyclist reserves the right to report any activity or persons that Competitive Cyclist suspects has violated any law or regulation to appropriate law enforcement officials, regulators, or other appropriate third parties (including the disclosure of appropriate subscriber information). Competitive Cyclist may also cooperate with appropriate law enforcement agencies to assist in the investigation and prosecution of any illegal conduct. Indirect or attempted violations of this Agreement and actual or attempted violations thereof by a third party on behalf of any user shall be considered violations of this Agreement by such user.
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.
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 http://www.bikepartsexpress.com/mm5/merchant.mvc?Screen=PROD&Store_Code=BPE&Product_Code=PD4005&Category_Code=
Do you know anything about Cleat set-back positioning? I place the cleat as far back as possible. I liked Sidi and Vittorria's cleat positioning but the fits were too narrow. I did not have hot spot issues with Northwave and Shimano but when I place the cleats on, it's too close to the toes. Any input for this Giro pair will be appreciated. Thank you.
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.
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.
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)
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.