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Castelli Nano Light Pro Bib Short - Men's

Item # CST00BC

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  • Black, S ($124.95)
  • Black, M ($124.95)
  • Black, L ($124.95)
  • Black, XL ($124.95)
  • Black, XXL ($124.95)
  • Black, 3XL ($124.95)
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Item # CST00BC


Stay dry when the temps are high.

As a retailer in the industry, we see lots of different cycling technology, so it can be hard to surprise us; however, when we first got our hands on Castelli's Nanoflex material, we admit to taking it straight to the office lunch room and running it under the tap to see if the water-repellent claims were true. They were. And with the all-new Nano Light Pro Bib Shorts, that water-resistance now comes in an even lighter, less insulated form.

Normally, insulation is a good thing in anti-weather kit, but we all know that a drizzly spring day can leave us chilly even in temperatures ranging above 60 degrees Fahrenheit — and a wet chamois just compounds the situation. Insulated kit has no place on days like those, so Castelli built the Nano Light Pro out of its Nano Light material, an un-brushed version of the Nanoflex material we rely on to keep the chamois dry in cold, damp weather. Like its insulated counterpart, Nano Light causes water to bead up and roll off of its surface, keeping our skin dry and avoiding the water chill effect that so often keeps us inside when the sky is looking ominous.

Not being brushed means the material has a tighter weave than that on the Nanoflex shorts, so the Nano Light actually offers a better shield against road moisture. It's still not quite on par with Castelli's Tempesta rain gear, but it will see most cyclists through the worst conditions they're willing to brave on two skinny, slick tires. Castelli is pitching the Nano Light Pro Bib Shorts for use with its shoulder-season Perfetto Jersey; however, we think they also line up well with the Imprevisto Nano Jersey. Like the Nano Light Pro, the Imprevisto is water-repellent but lacks insulation, so both are ideal for days when the rain has started to fall even if the temperature hasn't.

The shorts are built with minimal seams in order to reduce the potential points of watery ingress, and they're finished with reflective detailing — both of which are features that make sense considering the shorts' intended use on wet, often overcast days. The mesh bibs address one of our only complaints with the Nanoflex Shorts by giving way at the shoulders to Castelli's lie-flat, Carré yolk, and the saddle/cyclist interface is softened with the addition of a KISS Air chamois.

Tech Specs

Nano Light
yes, Carré
Leg Gripper:
flat leg bands
Claimed Weight:
[large] 197 g
Recommended Use:
road cycling
Manufacturer Warranty:
1 year

Size Chart


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Great Quality

    My Dad got these for Christmas and he likes them. I've had great experiences with Castelli products and I wanted him to experience the same. But, with European sizing, his normal XL wasn't fitting. It's nice to see Castelli making this in a 2 & 3XL. While they do fit well, he did say that the thighs are tight. Not a deal breaker, but an observation.

    Odd fit and quality for Castelli

    • Familiarity: I've used it several times

    As most have stated the logos per off immediately, the leg elastic is very narrow and very tight, the leg length is also about 2" longer than other castelli shorts I own. These are not what I've come to expect of the brand and made me step back to consider other options.

    From a wet weather functional standpoint, they do bead well and the treatment seems durable. The chamois gets disappointingly wet quickly. Not as solid as their other offerings (gabba, perfetto).

    Logo peels off easy

    • Familiarity: I've used it once or twice and have initial impressions
    • Fit: True to size
    • Size Bought: small

    I found the logos on the thighs peeled off a bit inside the package bag when I received it. I don't want to iron the logo to stick it back, I am afraid that would damage the fabric. So far, I have worn it once with gabba 2 convertible jersey. The short is comfortable to wear and really repels the water. However, the logo peels off even more after my ride. Castelli should fix the logo issue. This short is supposed to be Corsa Rosa their highest quality.

    Logo peels off easy

    I have a pair of these and see it as a benefit, not an issue. Now I don't have this massive Castelli logo plastered on my legs. I with they would sell them without the logo!!

    Avg. ride time: 2h 35m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Generally good, some disappointments

    • Familiarity: I've used it several times
    • Fit: Runs small
    • Size Bought: Small

    So I've worn these bibs a few times now; I'll echo that they do run a bit small as other reviews have stated - I am typically a S in most brands; the best description I can say is that there is a lot of compression in the legs. At 6'1", and 32" inseam I also found that the length of the inseam is quite long, almost going down to my knee.

    The "Castelli" logo after a few washes also has started to peel off which is super disappointing as this is a Rossa Corsa level of item.

    As far as wind and weather protection, it is fine.

    Runs extremely small

    • Familiarity: I returned this product before using it
    • Fit: Runs small
    • Size Bought: Small and medium

    5'6" 138 lbs. I wear small in my other 6 pairs of Castelli bibs. Could not get small on. Med. were long but the leg gripper portion was extremely tight (tourniquet-tight). These would be great for someone 5'9" 130 but not any heavier than that. They did seem really nicely made and a great bargain so very disappointing the fit was so much off.

    I did find the bibs loosened a little bit after a few wears. I suspect the nano fabric has less stretch or something or takes some wearing in.

    Yes, they have loosened up a bit with wear. The Medium are working OK.

    They work

    • Familiarity: I've used it several times

    Been wearing in April in Maine, 40s and 50s temp. Good compression in legs. Grippers at bottom of leg a bit too tight but they hold leg warmers firmly in place. I also stretched them out some by hand. Finished last ride with 1.5 hours of rain, 42 degrees and the nano fabric really does bead up. My gore leg warmers were wetter than the shorts. But the chamois still gets wet, there is no wind block or water proof fabric, just the nano properties. Paired with the full sleeve Gabba full sleeve top (also size large)these work well for damp or wet finish to a ride. When it was dry they breath well and were comfy for a metric. I am 5' 8 and got size L which is the same as most Castelli for me. Medium in other brands.

    The straps are stitched on backwards (the logo is on the inside?) The Castelli name is also on the inside of the leg grippers. Not too good for advertising. The logo on the outside of the legs peels off within a few washes. Otherwise, the fit is perfect.