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Fi'zi:k 3D Flex Moldable Insoles

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Item # FIZ2755

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Item # FIZ2755


If you've been pining over the Fi'zi:k 3D Flex Moldable Insoles, but you're more than satisfied with your current shoes, Fi'zi:k has answered your cries. Now, available independent of Fi'zi:k shoes, you're able to benefit from the 3D Flex's fully-customizable, heat-moldable comfort.

Partnered with Sidas Technologies of France, Fi'zi:k designed its insoles to provide customizable support to the longitudinal arch, metatarsal button, and the heel cup through the use of three distinct materials. For the metatarsal and longitudinal arch zones, Podiaflex was chosen. This poly-resin mix is a by-product of wheat manufacturing, with moldable properties that allow it to perfectly support and confirm to your arches. The second material targets the pedal axle portion of the insoles. Known as Ortholite, it’s a low-rebound foam that soaks up road chatter and vibration. Fi'zi:k specifically designed its shape to cover the area of an average pedal, keeping unnecessary weight and added material to a minimum. Finally, the heel cup is treated with a solid, supportive thermoplastic known as Transflux.

The combination of these materials, once heat-molded at your local Fi'zi:k dealer, provides you with supportive qualities that lead to more comfort on your rides. As Fi'zi:k puts it, the insoles provide support and efficiency, but aren't 'corrective or obtrusive.' And while this serves the needs of most of us, we recommend that you see podiatrist if you typically wear orthotics.

The Fi'zi:k 3D Flex Moldable Insoles are available in eight sizes from XX-Small to XXX-Large, with each size covering around one whole size. So, an XX-Small is appropriate for sizes 37.0 to 37.5, a Medium accommodates sizes from 41.0 to 42.0, and an XXX-Large is intended for sizes from 47.0 to 48.0.

Tech Specs

[metatarsal and longitudinal arch zones] Podiaflex, [pedal region] Ortholite, [heelcup] Tepex
Recommended Use:
road cycling, mountain biking
Manufacturer Warranty:
2 year

Size chart


36 3 1/4 4 1/4 230
36.5 3 3/4 4 3/4 233.5
37 4 1/4 5 1/4 237
37.5 4 1/2 5 1/2 240
38 5 6 243.5
38.5 5 1/4 6 1/4 247
39 5 3/4 6 3/4 250
39.5 6 7 253.5
40 6 1/2 7 1/2 257
40.5 7 8 260
41 7 1/4 8 1/4 263.5
41.5 7 3/4 8 3/4 267
42 8 9 270
42.5 8 1/2 9 1/2 277
43 8 3/4 9 3/4 277
43.5 9 1/4 10 1/4 280
44 9 3/4 10 3/4 283.5
44.5 10 11 287
45 10 1/2 11 1/2 290
45.5 10 3/4 11 3/4 293.5
46 11 1/4 12 1/2 300
47 12 13 303.5
48 12 3/4 13 3/4 310

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Here's what others have to say...

Avg. ride time: 7h 25m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Comfort at Last!

  • Familiarity:I've put it through the wringer

My feet suck, and with flat arches long days in the saddle cause both my arches, Achilles and calves to get unreasonably tight. So tight in fact, that early in March it led to an overuse injury that put me on the couch for 5 weeks. I tried a lot of things to reduce this pain heel lifts, bike fit adjustments, other insoles and several shoes and nothing was quite perfect.

These insoles from Fizik combined with the shoes I was originally using, have made all the difference. Plenty of arch support, comfortable/supportive heel cup and perfection in stiffness in your power transfer make these a perfect insole. I let them heat mold overtime, and though the first week was a bit rough it's been plenty worth it.

No doubt these are going to be more taxing on the wallet, but the support, comfort and performance are absolutely worth it.

If you have any questions on these insoles, please give me a shout on Live Chat or reach me by phone at 1.888.276.7130 ext. 4579.


Insole molding

  • Familiarity:I've used it several times

I have been using for two years and its molding better with use rather than heat molding. You only have to copy the shape of the original insoles of your shoes, and then you get it. Works perfect!!

Are you saying there is no need to have them heat-molded? That these will work out of the box?

Do you have to take this to a fizik dealer...

Do you have to take this to a fizik dealer to get molded?

Yes, just take that in to your local Fi'zi:k dealer and they will mold those for you.