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For the bad-weather days.

Cold is one thing –layer up, ride hard, and you’ll stay pretty comfortable. Cold and wet is another thing entirely, and for that we have to recommend Castelli’s Nanoflex Bib Tights. We haven’t come across another product that keeps us warmer, dryer, and more comfortable when the weather is truly questionable.

The Thermoflex fabric is coated with nanofilaments that give it water resistance. You throw a glass of water on these tights, and the water will bead up and slide right off. Same thing happens out there on the road. The backside of the Thermoflex fabric is a brushed, fleecy-feeling face that traps your body’s heat to keep you warm.

Of course, a pair of bib tights wouldn’t be much with a garbage chamois. Thankfully, Castelli sewed in their venerable KISS3, a low-profile, supportive chamois that will help you stay comfortable throughout base mile season.

  • Thermoflex fabric is water-resistant and insulating
  • KISS3 chamois
  • Mesh bib straps

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Here's what others have to say...


Totally awesome...down to 42F and rainy

  • Familiarity:I've put it through the wringer

I wore these every week in the PNW this winter, rain or shine. Did the job very well. Only issue is that on particularly cold and rainy days the knees and thighs start to feel exposed. Riding in 40F weather in soaked conditions was not as fun.

I have not had any issues with lettering falling off, but I never use the dryer for my technical wear. Hang to dry only.


Great on a cold day

  • Gender:Male
  • Familiarity:I've used it several times
  • Fit:Runs small

So having the cycling bug is been good and bad. The part that makes the ride the best is really the gear and being dressed for the weather makes all the difference. I am 6'3 and 200lbs (34" x 34" pants) and the XL fits very well. The zippers at the ankles work fine especially over socks. These bibs will keep you warm on rides in the upper 30's - in fact I wore them today, it was 37F and I was warm enough. They also wick the water pretty well, and do keep me pretty dry. So far I love them, I have had them on for about a dozen rides and all is good. One suggestion if you do a lot of cold weather riding is windstopper boxer shorts. Really help in the "man" area. I hope these work as well for you as they do for me.


Faulty Zipper

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

Just bought these last month. They work well but be careful of the zipper. Best to zip them up first then pull them over you shoe covers. The zipper has small teeth and wants to pull apart too easy as mine did. Also, zip them up before putting in the wash. I will order another pair after returning these.


Getting the job done!

  • Gender:Male
  • Familiarity:I've used it several times

I live in Portland area where it rains 10 months a year and these tights are just what I need for most of the time. Nice compression and fit every spot. Completely windproof, haven't tested water protection yet. I don't usually start the ride when it's pouring, but it rains here anytime during the ride, as long as they have good enough water protection to get home, I am okay with it. Chamois is okay, on the edge for 50 miles. I am 5'8" 150#, ordered M first, they were too tight, sent back for a L and they fit nicely with plenty of compression still, just about 1" too long. The only dislike is the Castelli's name printed on both sides of the tights that already started peeling off after a few rides. I don't really care much for these and rather not have them printed on , but come one Castelli! do it right then just leave the prints off. Why made a nice tights and half a$$ job on these. Made in Macau

Exactly - the Castelli print started peeling almost immediately. I finally mercy killed a few letters and just pulled them all the way off. Plus, I'm not a fan of big logos on my glutes. Beyond that, I now have about 1000 winter miles in these, and they do well. Not truly waterproof, but warm enough that in moderate rain I don't feel much discomfort. The pad is good beyond a century (my max in them was 112 miles and they were fine) and the straps don't bother me until about hour 5. So far, the best winter tights I've found. Now if Castelli would just give us a stealth print....

These look great. I am 6'3 and wear 34 /...

These look great. I am 6'3 and wear 34 / 34 pants. Any idea what size to get? Will a large be too short? Thanks.

I checked the size chart on the Castelli site for you;

Inseams are:

"L" =83cm (approx. 32")

"XL"=84cm (approx. 33")

and a "2XL"= 85cm (approx. 34")

Castelli runs a bit smallish...would suggest the "XL", or the 2XL for inseam length.

Protective booties will offer some protective "gap" coverage, worst case.

Hope this Helps

2xl I'm 6'4" 32/34 still tight but stretch a little


Does What it Says

  • Familiarity:I've used it several times

About 500 miles into Fall in the Pacific NW, and these tights do what they're asked. Completely windproof and - so far - waterproof in a lightweight package. I haven't been caught in a 2 hour Seattle downpour yet, but I have been drizzled on almost continuously for more than an hour and stayed completely dry. I've been using the Gabba top for two years, and its absolutely flawless. These tights are probably not as waterproof, but not bad at all. They're so warm down to about 37-38 degrees F I don't need long wool socks to keep in contact with my extremities. Sizing seems spot on; I wear a medium in all other Castelli products top and bottom, and these (in medium) are almost race fit but not uncomfortable, and breathe well. If you're riding in crap weather, or potentially so, the nanoflex tights are probably your best bet short of bulky, sweaty rain pants.