Castelli Nano Flex Pro 2 bib tight review

One of many competing Castelli options, but is the Nano Flex Pro 2 the right winter bib tight for your climate?

Castelli Nano Flex Pro 2 bib tight
(Image: © Josh Ross)

Cyclingnews Verdict

Castelli offers a trio of winter options in its highest performance Rosso Corsa product line. Being a Rosso Corsa product means the best quality chamois and the Nano Flex Pro 2 bib tight is the option aimed at wet and cold, but not sub-zero, winters. If that’s what you need, these could be enough to get you through the winter.


  • +

    Large area of high reflectivity at both ankles

  • +

    Limited seams

  • +

    Progetto X2 Air Chamois

  • +

    Rubberised sewn-on logo will not peel and crack


  • -

    Short leg length makes sealing at ankles more difficult

  • -

    Low in the abdomen

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Castelli makes a winter bib tight for every situation, and while there’s a lot of overlap, they each have their unique set of features. You could get away with using any of them for most winter situations but it also makes sense to choose the option that fits your needs best. Our list of the best winter bib tights for cycling in the cold highlights a couple of the most well-rounded options. For those that want to specialise a bit more, that means looking outside of the list. 

If cold and dry weather is what your winter looks like then the Sorpasso RoS Wind bib tight is the option that makes more sense. If you've got a winter that looks just a little warmer and quite a bit wetter then that means you are going to need a different option. Castelli thinks that might be the Nano Flex Pro 2 bib tight so we put them to the test on the bike. If that sounds like it might match your winter needs, keep reading to see what we think.  

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Josh Ross

Josh hails from the Pacific Northwest of the United States but would prefer riding through the desert than the rain. He will happily talk for hours about the minutiae of cycling tech but also has an understanding that most people just want things to work. He is a road cyclist at heart and doesn't care much if those roads are paved, dirt, or digital. Although he rarely races, if you ask him to ride from sunrise to sunset the answer will be yes. Height: 5'9" Weight: 140 lb. Rides: Salsa Warbird, Cannondale CAAD9, Enve Melee, Look 795 Blade RS, Priority Continuum Onyx