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Vent your feet.

The Sidi Genius 6.6 Vent Carbon Shoes feature the same tech features as the Wire, with classic cycling shoe style.

The Sidi Genius 6.6 Vent Carbon Shoes, and the latest shoe to grace its top tier, the Wire, share quite a few commonalities. In fact they are like fraternal twins, with the same flagship design and features, but different aesthetics.

The Genius, features a somewhat more traditional upper design than the Wire. This is the result of the two very different closure systems used. While the Wire uses the Techno3 Buckle system, the Genius 6.6 uses a two-way ratcheting caliper buckle. This system, invented by Sidi and only imitated by other shoemakers, allows you to adjust the fit of your shoes, in small increments, anytime. Complementing the caliper buckles is a hook and loop strap that further adjusts the volume of the shoes. The industrial-grade hook and loops are patented, and they won't fray or lose grip over time. This three-point closure system ensures the perfect fit. If you like to wear your shoes on the snug side, the shoe's tongue and instep strap have both been padded generously to allow for extra comfort.

Sidi's Heel Security System (HSS), a band that runs on the outside of the heel, keeps your feet firmly planted in your shoes. With the help of a small Allen key, you simply secure it over your Achilles tendon to ensure that regardless of how much power you are putting into your pedal stroke, your heel stays put.

The Genius 6.6 are built upon the same sole as the Wire. It is essentially the sole that is used on the Ergo 3, with the same construction, but for the Genius, Sidi removed about 38 grams from its weight. The Vent Carbon Sole features the same rigidity that Sidi is known for. Additionally, the soles are vented at the toe. This vent, unlike competitors', may be open or closed depending upon the weather and personal preferences. They were designed so that the air flows through the insole which helps to pull moisture away from your feet keeping them cool and dry.

The buckle system, Heel Security System and vented sole ensure a near custom fit, and the Lorica microfiber uppers with ballistic mesh inserts provide matched comfort and durability. Lorica is a synthetic leather that, unlike real leather, doesn't stretch or harden when wet. The mesh inserts aide in keeping your feet cool.

The Sidi Genius 6.6 Vent Carbon Shoes are available in the color Black Vernice/white and in whole and half sizes from 39 to 48. Most sizes also have an Mega option available for those requiring a high-volume shoe. Please note that these shoes are only compatible with standard, three-hole road cleat systems.

  • Vented carbon fiber sole
  • Identical to the Wire, except for closure and aesthetic
  • Heel Security System
  • Caliper Buckle and High Security Velcro closure

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Here's what others have to say...

4 5

I won't stray again

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Purchased: 43 1/2

I've been using Sidi's Genius 5 shoe for years now both for road riding and commuting. I probably have 4-5K miles on my last pair. So when I bought a new road bike and upgraded to Look pedals, I let the bike shop guy talk me into another brand of shoe to use exclusively for my weekend road rides. He suggested the velcro on the Sidi shoes would eventually wear out, so the wire system on the Specialized shoe would be better. Well it turns out that Sidi just makes a far better and more comfortable shoe. I would get hot spots and numbness on the bottoms of my feet within 45 minutes of riding, and would have to get off my bike and walk around to go for more than 90 minutes or so.

So I decided to cut my losses and invest in a new pair of Sidi's and never look back. So far I've only used the Genius 6.6 on my trainer (it's been a tough winter here in Boston) but they fit like a glove, the are super stiff, light, and breathable. I can't wait to finally get them out on the road, but based on my Genius 5 experience I am not the least bit worried about the velcro.

The only reason I give these shoes 4 stars is the price. They are a bit lighter than the Genius 5, have a stiffer sole, and they look way cooler, but are they really $250 better? Hard to say but I know that this summer when I'm 2 1/2 hours into a ride and my feet still feel great, I won't be complaining one bit.

I won't stray again
5 5

Worth the premium price

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

I bought these to replace my white Sidi Ergo 3, which also had a similar color combo, carbon weave sole, a vent, and a ratcheting top strap, but with 2 rotary tightening fasteners like on the current model Wire. The wire fasteners on the Ergo 3 worked, and the nylon wire surprisingly never broke, but I was never a fan of twisting to tighten, and found it a little awkward and gimmicky.

I replaced my Ergo 3 with these 6.6 Vent because I really like the ratcheting strap but personally find the 2 lower Velcro(R) straps more convenient, reliable, and intuitive to use. The carbon sole on the 6.6 Vent is extremely stiff, which I actually find to be highly comfortable in how efficiently it transfers power to the pedals. I leave the vent "open" for the hot Texas days, though I can't say for sure that I notice the difference. Could be because they are still new, but I feel like the footbed is more comfortable than my old Ergo 3s were. My first ride on the 6.6 Vent was a hot, brisk century, and I had no issues the entire ride.

These are not cheap, but for me, the combination of features and overall high-end materials and design justify the premium price. If I bought a 2nd pair as an alternate I would look at one of the more value-priced Sidi shoes which are probably also great for the money.

5 5


  • Familiarity: I've put it through the wringer

I wore these for a hard 8000 miles season last year and am on my second with them. The shoes are super durable look decent, fit pretty darn good and are well ventilated. I have a longer second toe so I do have some issue with the fit as far as length. I imagine if you have normal feet these would totally rock your world. I will probably go semi to full custom next pair of shoes, but overall Sidi is a stand out brand that will make your cycle feet happy.

5 5

Just like Ivan Basso

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

Bought these for my dad who has worn a pair of Sidi's for about five years this pair. So far he has worn them on a couple of rides and says that they fit very similar to other Sidi's he has worn. He loves how the venting and how well air moves through. All in all it is a great quality Italian shoe; stiff, lightweight and well made would recommend this product.

5 5

Great Italian Quality

  • Familiarity: I've put it through the wringer

This is a superb pair of shoes. I purchased a pair back in the summer and love the quality and fit of these. They are very ventilated and i do not get hot spots when wearing them. I am a US size 11 and the 45.5 fit perfectly. They stay nice a snug on the feet and the straps are very easy to adjust. This is my second pair of Sidi's. The first pair lasted me 8 years so they have awesome quality. Just what you would expect from an Italian shoe.

Great Italian Quality
5 5

Too Big!!

  • Familiarity: I returned this product before using it

I recently found that normal shoes do not fit me well. I have wide feet. After trying a size 44 at a store I decided to order the 44 MEGA. When I received them I realized that they were too big. Competitive Cyclist does not have the 43.5 MEGA in this style so I order the Sidi 5 Carbon and I will see how they fit. They look like a really good shoe very disappointing they don't have my size.

5 5

The Best Road Shoe

I have ridden Sidi's for the last 5 years. My first pair were Genius 5. I would rate them fair. These Genius 6.6 are excellent. They have addressed all the issues I had with the 5's. they are extremely well vented., they provide great side support where the 5's had none. The wide size fits my toe box perfectly without allowing me to swim in the rear of the shoe. This shoe actually fits American feet, not just Italian feet! I will keep buying these. 5 stars.