Transiro Hydra
As low as 149.00€
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Transiro Hydra

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Our highly breathable, comfortable triathlon cycling shoe constructed from 3D air-mesh fabric for cooler, drier feet and built with a single-strap closure system for rapid transitions.
Transiro Hydra
As low as 149.00€
Add to Wish List
Add to Wish List

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In stock


LENGTH (mm) 230 237 240 243.5 247 250 253.5 257 260 263.5 267 270 273.5 277 280 283.5 287 290 293.5 297 300 303.5 310
US 4 ¼ 5 ¼ 5 ½ 6 6 ¼ 6 ¾ 7 7 ½ 8 8 ¼ 8 ¾ 9 9 ½ 9 ¾ 10 ¼ 10 ¾ 11 11 ½ 11 ¾ 12 ¼ 12 ½ 13 13 ¾
EU 36 37 37.5 38 38.5 39 39.5 40 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45 45.5 46 46.5 47 48
UK 3 ¼ 4 ¼ 4 ½ 5 5 ¼ 5 ¾ 6 6 ½ 7 7 ¼ 7 ¾ 8 8 ½ 8 ¾ 9 ¼ 9 ¾ 10 10 ½ 10 ¾ 11 ¼ 11 ½ 12 12 ¾
Delivery and Returns
Europe, US & Canada: 1-3 working days
Rest of the World: 2-4 working days
See Shipping/Returns section.
Transiro Hydra
As low as 149.00€
Read Reviews

Hydra is a triathlon bike shoe designed to facilitate easier transitions, built with a breathable upper and moderately stiff nylon outsole that combines comfort and pedaling efficiency.



As transitions become increasingly important—now considered the fourth discipline in any triathlon event, be that a full Ironman race or sprint distance—we have redesigned our tri-shoes range to meet the requirements of the most demanding athletes. Hydra is built with a single Velcro strap to allow faster, worry-free transitions, where any mistake can cost decisive time. Additionally, the enveloping strap provides the strong foot support athletes need to be efficient in every race situation.



The simple closure system is coupled with an upper made of 3D air-mesh fabric for a shoe that’s highly breathable to help avoid overly sweaty feet, making this an optimal solution for those who prefer to race sockless.



The newly redesigned R5 nylon outsole offers comfort and a moderate level of stiffness for efficient pedaling. Additionally, cleat positioning is set slightly further back compared to traditional settings to better optimize pedaling efficiency and reduce knee compression. A wide vent inlet provides cooling airflow, aiding in temperature regulation.


  • 3D air mesh: highly breathable mesh construction
  • R5 nylon outsole
  • Stiffness index 6
  • Weight: 233g
  • Sizes: 36-48 (37 to 47 also in half sizes)


Great fit, relaxed shoe, breathable and fantastic style..
Verified purchaser | Order code : 192523954
Love the shoe! Works great for flying mounts/dismounts.
Verified purchaser | Order code : 186245846
Good morning, The shoe corresponds to the description. It is quick to put on and take off. It sits well on the bike. However, she fits really big. I wear a size 46 so I ordered it in 46 and yet I float inside the shoe...
Verified purchaser | Order code : 188958319
Extremely satisfied. Perfect in transition and very comfortable
Verified purchaser | Order code : 188249870
Beautiful shoes that fit so well! Can’t wait to wear them on race day!
Verified purchaser | Order code : 187316472
I really like the cycling shoe overall. It's solid and feels proper. I like the straps and they are easy to adjust on the bike. The strap being over the top is a nice feature for getting that snug fit without awkward angles. I also like the pull tab, it feels strong and helps. I think the sizing runs a bit small, which is unfortunate.
Verified purchaser | Order code : 184486128
I love how easy is the place my feats during a flymount...
Verified purchaser | Order code : 184487264
Super top, comodissima, leggera e top x transizione
Verified purchaser | Order code : 185287280
light and fresh for the best and fastest performance
Verified purchaser | Order code : 185153292
Great light weight shoe with comfortable upper. Fit is pretty straight lined. A little narrow in forefoot and wide in heel but I also have duck feet (wide forefoot and narrow heel)! :) The mesh upper should allow for this though.
Verified purchaser | Order code : 183183390
My first pair of Fizik cycling shoes - just got them so not sure of longevity or how they perform in a race. But for the several times i trained in them i am impressed with the fit and comfort.
Verified purchaser | Order code : 181497853
The delivery service was awesome, the shoes are great, only thi g is that you should goa half size les for US size buyers. The rest, I just have to say these are great shoes for Tri.
Verified purchaser | Order code : 180265451
very good shoes for triathlon, i buy the red, fresh, light
Verified purchaser | Order code : 178967051
Pretty good shoe for money, fast return and ordering new size
Verified purchaser | Order code : 178967035
Good looking shoes, they do what we were expecting. Yet they are some what fragil and a few marks exist just after the first transitions training. I have seen some older models with the front in leather which I find is much more resistant.
Verified purchaser | Order code : 177442682
Shoes sound great but haven't tried them on bike yet
Verified purchaser | Order code : 175911125
Have worn for 4 rides so far, longest being 3.5 hours, and really comfortable. Looking forward to racing in them!
Verified purchaser | Order code : 174634469
superb shoe and superb service - very happy
Verified purchaser | Order code : 174802579
Excellent shoes, really comfortable. I'd been looking for a replacement pair of cycling shoes for some time but with fairly specific requirements - white or off-white, a velcro strap (boas cause soreness for me, and laces are a faff). I found them very comfortable, easy to put on and secure on the foot. My only complaint is that the cleat position is fairly set back on the shoe, and is not adjustable, so one point deducted.
Verified purchaser | Order code : 174633758
Pantofole, pratiche, leggere! Super consigliate
Verified purchaser | Order code : 168514589
Extremely comfortable and very well looking shoes. Also, quality materials used. However, I have a bit of a problem with the design. It has a horrendously long strap. I have a long, but narrow feet and I have to destroy my very first fizik shoes by cutting off at least 3cm of the strap.
Verified purchaser | Order code : 166424804
Not fit. Just came back from a 15 mile ride. Too tight in the toes and too loose in the heel. I measured a 44 for the width. Do you use a woman’s foot for the mold? Women tend to have a wide last as I do and a narrow heel. These shoes are designed for a man’s foot. I ordered a woman’s shoe. I could not return per company policy. Also while a single strap is a good concept for transition this one is too long. It got caught in my chain, luckily, I was on an indoor bike. I needed to trim at least 2.5 cm to stop that from happening. I thought maybe I could use them just for training rides but my foot pulls out or the shoe on the upstroke found that out today. Added time to my ride. More than I would save in transition. The shoes are useless to me. Maybe a 42 or 43 would fit better but don’t want to invest more money in this product. Concept is great execution of design for women is not. Very disappointed. Not recommend for women.
Verified purchaser | Order code : 160651287
The Infinito Hydra have a great feel without socks! I’m so looking forward to using them in a triathlon
Verified purchaser | Order code : 160566815
very comfort shoes, i definitely recommend
Verified purchaser | Order code : 159991636
Great product. Works extremely well for quick and efficient transitions
Verified purchaser | Order code : 160459700
Perfect! Super light and breathable. Triathletes will definitely appreciate the shoes
Verified purchaser | Order code : 160104983
Great fit and high quality. Worn 500 miles in training and then for Ironman. I do not wear socks and I have had no issues. The Velcro strap could use a better edge stitching because it can bite into top of foot.
Verified purchaser | Order code : 151683402
There is no doubt this product is an excelent high performance cycling shoe made with quality materials so I'll cut to the chase with the only issue I have with it. The upper strap (The one with the Fizik logo) its too long and whenever I tighten it the edge (of the strap) touches the pedal arm of my bike when I'm pedaling. This is a problem because it causes the strap to untighten and I fear in the long run it might get damaged.
Verified purchaser | Order code : 156561434
Love these shoes! They fit perfectly and are super comfortable.
Verified purchaser | Order code : 156457356
Scarpa acquistata per il triathlon, molto traspirante, ottimo prodotto
Verified purchaser | Order code : 155734178
The velcro strap catches on the crank, unwearable. No easy way to contact Fizik. Quality form does not accept UK post codes, and the Contact form does not accept images in JPG or PNG format.
Verified purchaser | Order code : 153120463
Belle ma non le ho potute usare, consiglio un numero in più.
Verified purchaser | Order code : 154558479
I wanted to like these shoes as they do have some clever design features for triathlons, but no. The big problem is the fit. Doing the whole printout fitting procedure, it said I should be a 48. I’ve never been a 48 in any brand;47 at the biggest. So I ordered the 47. Once I got the 47, way to big and had to deal with the annoying process sending back the 47 and reordering the 46. Now I’ve put in 5 rides on the trainer and I can’t use these shoes anymore. The arch support is way too forward and puts pressure in all the wrong spots. Maybe it’s because the shoe is still too big and I need a 45. But again, the fitting chart had me at a 48, so then it’s completely useless. Another problem, the strap is too long and hits on the cranks almost every pedal stroke. If I was actually going to race in these shoes, I would cut a few mm of the strap to stop the rubbing. Hopefully I can sell these on eBay and recoup some cash.
Verified purchaser | Order code : 153317752
These are some of the most comfortable shoes that I've ever biked in. Even 5-6 hours later when my feet start to swell, I haven't had any discomfort with these shoes. I highly, highly recommend them! These shoes breathe really, really well!! They don't hold sweat or rain, and the cleats have more adjustability than the other Fizik R4s. They are stiff as well! Great for racing or training rides! I have wide and flat feet and these fit me great. The R1 and R3 are too narrow for me but these are perfect! I'll be buying these again in the future!
Verified purchaser | Order code : 153423331
I have ridden the these shoes once and so far I like them. They aren't as stiff as my regular road shoes, but are much easier to get on. I do wish they closed the other way. The straps close to the inside. The end of the strap on my right shoe hits the crank arm. I'll have to cut a bit off the end of the closure strap
Verified purchaser | Order code : 152280985
Schöne, bequeme Radschuhe! Größe stimmt mit meiner normalen Schuhgröße überein
Verified purchaser | Order code : 152281655
Very breathable and comfortable. My toes no longer go numb
Verified purchaser | Order code : 151035964
The shoes fit very well. However, when tightened, the end piece of the strap is loose an touches the bracket with every revolution. This is very annoying. What can I do? I do not want to cut off this end piece.
Verified purchaser | Order code : 150774206
Très belle paire de chaussures, j’adore! Le look est top et féminin à mon goût! Cependant, elles sont très fragiles…
Verified purchaser | Order code : 149005162

ROAD — Designed and engineered to perform on paved roads, from the smoothest tarmac to the most demanding pave


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