Sidi Kaos Shoes

Sidi Kaos Shoes
  • Color: Black
  • Color: White
  • Color: Yellow Fluo
  • Color: White/Orange Fluo
  • Color: Green Fluo
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Sidi does it again with their Kaos Shoes. Sidi combines advanced technological features with their decades of fit and ergonomic expertise to make every day on your road bike more efficient and comfortable. Power transfer is unsurpassed with Sidi's super light and stiff carbon composite soles. And, maximum comfort comes in the form of Sidi's Tecno 3 closure system that uses supple, low-friction wire laces for even pressure distribution and one-click adjustment for fine-tuning on the fly. Plus, the supple, breathable and super-durable Lorica uppers provide a custom fit and feel you'll love.

Fitting Yourself to Sidi Cycling Shoes

There is no substitute for a perfect fit. Your shoes are the most important contact point between you and your bike, affecting power, comfort, and providing that locked-in feeling of oneness with your bicycle.

Fitting tips
Try shoes on at the end of the day — your feet swell by at least a half-size as the day progresses, and as much as a full size on hot days.

Stand up. Feet expand under pressure — standing up will give you a better sense of how your shoes will fit under pedaling pressure.

Bring the socks and orthotics you ride with — they have a tremendous influence on foot volume and fit.

Be patient! Non-leather cycling shoes do not stretch over time — how they fit in the store will be how they fit, period. However, as the shoes warm up from body heat the uppers will become more pliable and conforming. Give your shoes at least 10 minutes to heat up, and readjust the closures to accurately gauge how they’ll feel mid-ride.

Foot measuring devices typically measure length and width only, and do not account for overall shape or foot volume. It’s imperative that you try on shoes a half-size larger and smaller than your measured size, for confirmation of proper fit.

How Sidis are sized
Sidi half sizes are 3mm longer, with slightly increased toe box volume. Full sizes are 6mm longer, with proportionally greater volume.

Standard-size Sidis roughly correspond to a D width on the industry-standard Brannock sizing scale.

Mega sizes are cut with more material throughout, and larger-volume heel cups. Mega sizes roughly correspond to an EE/EEE width on the Brannock sizing scale.

Narrow sizes are cut with less material throughout, and narrower, lower-volume heel cups. Narrow sizes roughly correspond to a B/C width on the Brannock sizing scale.

Women’s Sidis have a more tapered shape and lower volume than standard or narrow-width Sidis. Women with consistently wide or narrow feet, from heel to the forefoot may experience better fit in Sidi standard or narrow widths.

The four common cleat bolt patterns.
In order to mount your pedal cleats to your shoes (cleats are included with new pedals and sold separately), the cleats and shoes must have matching bolt patterns. 

There are four cleat configurations found on cycling shoes (diagram): SPD-R, Look/SPD-SL, SPD and Speedplay. Road shoes feature one, two or even three of these. Off-road shoes usually use the SPD pattern. If you're unsure which cleats your shoes require, please ask us. We're here to help!

Lorica is a lightweight, flexible, water repellent and breathable material made of the finest microfibers. It's amazingly durable and, like leather, it improves with age.

Sidi Soft Instep Closure System
Sidi's Soft Instep Closure System is anatomically shaped to eliminate pressure points in order to provide a snug, secure, and ultra-comfortable fit.
Sidi Tecno 3 buckles
Sidi's Tecno 3 buckles make it super easy to fine-tune how tight your shoes are even when you're riding. The low-friction wire laces tighten and loosen freely so you can dial in the perfect tension and enjoy total comfort on every ride.
Sidi Fit Relievers
Sidi's Fit Relievers are tiny cuts in the tongues that reduce bulk and keep the tongues from ever rolling over for maximum comfort.

Part Numbers

Option UPC MPN
Black / 39 2000000448893 SRS-KAS-BKBK-390
Black / 39.5 2000000448909 SRS-KAS-BKBK-395
Black / 40 2000000448916 SRS-KAS-BKBK-400
Black / 40.5 2000000448923 SRS-KAS-BKBK-405
Black / 41 2000000448930 SRS-KAS-BKBK-410
Black / 41.5 2000000448947 SRS-KAS-BKBK-415
Black / 42 2000000448954 SRS-KAS-BKBK-420
Black / 42.5 2000000448961 SRS-KAS-BKBK-425
Black / 43 2000000448978 SRS-KAS-BKBK-430
Black / 43.5 2000000448985 SRS-KAS-BKBK-435
Black / 44 2000000448992 SRS-KAS-BKBK-440
Black / 44.5 2000000449005 SRS-KAS-BKBK-445
Black / 45 2000000449012 SRS-KAS-BKBK-450
Black / 45.5 2000000449029 SRS-KAS-BKBK-455
Black / 46 2000000449036 SRS-KAS-BKBK-460
Black / 46.5 2000000451060 SRS-KAS-BKBK-465
Black / 47 2000000449043 SRS-KAS-BKBK-470
Black / 48 2000000449050 SRS-KAS-BKBK-480
White / 39 2000000446691 SRS-KAS-WHWH-390
White / 39.5 2000000448626 SRS-KAS-WHWH-395
White / 40 2000000446707 SRS-KAS-WHWH-400
White / 40.5 2000000448633 SRS-KAS-WHWH-405
White / 41 2000000446714 SRS-KAS-WHWH-410