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  • Castelli Nano Light Pro Bib Short - Men's
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CastelliNano Light Pro Bib Short - Men's
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Item # CST00BC

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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 SpecsSize
Tech Specs
Nano Light
yes, Carré
Leg Gripper
flat leg bands
Recommended Use
road cycling
Manufacturer Warranty
1 year


Men's Apparel




















































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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Again, different folks...

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small

Castelli's Corso Rossa is actually cut for pro racers (and the like, with or without their power output,..ahem.) I've got news for the reviewers who state the legs on these are too long: take the pictures of Sean Yates off your wall--short short bibs were never cool, and certainly are not today. Look at Fernando Gaviria's or Peter Segan's (or even ultra-lanky Froomy's) bib lengths for just a few of examples of modern good style in cycling. It is good to have more leg coverage on bibs intended for cooler temperatures (not to mention the increased water-resistant material coverage), also the increased length will help hold up leg/knee warmers. People who are concerned with performance will know that you should keep your knees covered at temperatures under 65-70 degrees; look at the pros (who are older than 23) at your local group ride in cool temperatures--they are easy to spot even while not riding, as they are the ones who have at least their knees covered. Racing in cool/cold temperatures is bit different because you are creating more heat and are usually drafting most of the time AND likely have embrocation on if no knee/leg warmers. However these bibs are NOT as long as the Omloop version--those are just strange unless you have VERY long legs. The Nano Light material is slightly less stretchy than lighter weight, water pervious materials. Soooo,... size up. I am 5'9" and 140lbs with wider shoulders and hips and the size large in these fits me perfectly. The lycra on the strap tops makes them some of the most comfy straps I've ever used. If these had nano material over the crotch you likely couldn't have children if you were to wear them often (and for longer than 1.5 hours) as the nano material is not stretchy enough for comfort in that area. As for the peeling lettering, I have not yet noticed that, but won't be surprised if it happens; and that definitely won't bother me much. Also, I actually prefer the Kiss Air pad better than their Progetto pad. I ride a 143mm wide saddle and the chamois size/placement is perfect for me.

Decent but not great

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

I got a medium being 6ft tall and 168lbs, on the tight side but nothing crazy, length is perfect (goes down to right above knee) it would likely be too long in large, if you stand the straps pull a bit but while riding its a good fit, the "chamy" is certainly a fit for narrow "italo" sit bones, the quality is soso i don't see this lasting more than a season of regular use, fine to get it on Sale. Cannot comment on foul weather yet but ok in mild to cold weather.

Not the most comfortable bibs

  • Fit: Runs small
  • Size Bought: Large

I typically wear a Medium in bibs, but after reading several reviews from other similar sized riders, I chose to go a size up. I'm 5'9 weighing 166 pounds. I'm roughly 17% body fat so I'm not super lean, but also not obese. I also have wider sit bones and have a 145mm width saddle. I further purchased these while on sale.

I have only one ride in them, and they are not the best fit for my body. The suspenders are wide which is fine. However the shorts are very tight. I also expected the inseam to be shorter, but they come up just above my knees. There is only a 1 inch gripper on the bottom of the pant which left me feeling like my calves and feet were losing some circulation. As for the chamois, it is too narrow for my sit bones. It covers them, but barely. Also the chamois is pointed on the end so it feels as though it is crawling halfway up my backside.

If you have narrow sit bones then this bib could work for you. If you are leaner than I, then this bib could work for you. I don't believe going to a larger size would help bc the upper was fine, but the bottom was not the greatest in fit. This would probably be best suited for someone over 6 feet tall.

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: 1h 36m 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.