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Sidi T4 Air Carbon Composite Triathlon Shoe Black/White
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T4 Air Carbon Composite Triathlon Shoe

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Sidi's T4 Air Carbon Composite Shoe is all about quick transitions and maximum performance for triathletes. A stiff Twelve Carbon Composite sole is made of carbon-fiber reinforced nylon that retains its efficient power-transfer through the wet and through the heat, season after season.

All that stiffness doesn't matter much if you can't get into the shoe, so to ensure you don't lose time during transition, Sidi uses two hook-and-loop closures for quick adjustment and a large pull-tab that lets you slip easily into the shoe's tongue-less upper.

While riding, you'll be cool and comfortable in Sidi's Politex synthetic upper, which is extremely durable and features all-over perforations to increase breathability and provide drainage.

Replaceable heel pad. Compatible with standard 3-bolt road cleats.


  • Sidi Heel Cup for optimum pedaling position
  • Large pull-tab for easy on/ off
  • Carbon-reinforced Sidi Twelve sole
  • Vented Politex upper
  • Outward opening upper strap doesn't interfere with drivetrain

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. Cleats may have been mounted leaving minor marks on the soles. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Discount Codes are not applicable to Closeouts.

This product is NOT Eligible for VIP Points.

This size chart provides our best estimate for which European shoe size to choose based on your US shoe size. This will not necessarily match the US size shown on the product, but it is the best guidance we can provide for this particular brand.

If we've noticed that any particular model deviates from the standardized chart, we will list this information in the product description.

Please contact us with any questions.

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If you want long-lasting, comfortable shoes, go with Sidi
by YBS
Cycling Enthusiast
Madison, WI
13 of 13 customers found this review helpful.

First, about Sidi. This is only my second pair of Sidi shoes because the first pair lasted 14 years. In fact, I really could have kept using them, but the velcro was coming apart on the straps. Yeah, I could have fixed that pretty easy enough, but I figured I would upgrade to a newer, stiffer pair (and I figured that 14 years was good enough for a pair of shoes). Sidi shoes are top-notch quality. They last a long long time, and they have replaceable parts that extend the life even further. If you're budget-oriented, the cost of ownership per year is really low if you factor in getting 10 years out of them.

Now, for the shoes, these are for people who either 1) race in triathlons, or 2) like the simplicity of two velcro straps rather than 3 straps or boa laces or whatever other strap mechanisms are out there. Personally, I fall into both of those categories. I am a casual triathlete and I haven't been sold on needing all sorts of strapsratchets on my bike shoes. I only ever undo the top strap, so getting these things onoff is quick. The only bad thing I have to say about the shoes is that the straps are in opposing directions. I understand that it's supposed to help dial in an even fit across the foot, but I find it a tad annoying for times when I am adjusting both straps.

The break-in period for me was about 150 miles, but now that I'm past that annoying phase, they fit just as well as my last pair. I like that these are super-vented because I can always add a neoprene sleevebooty if it gets too coldwet. Oh, and they're lightweight and stiff - just what you want in a pair of shoes.

Reviewed 1/14/2018
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By far the best tri shoe
by Chas Pavlovic
Competitive Racer
San Francisco Bay Area
6 of 6 customers found this review helpful.

Best of the best shoe out there SIDI. The new meshed structure is extremely comfortable and flexible. Allows the adjustments for various foot width. I suggest buying on the large size to allow plenty of comfort for the toes and then tighten up the straps for an adequate fit.

Reviewed 11/9/2017
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