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Item # CST2471

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Item # CST2471

The winter's edge.

Some winter tights may keep you warm, but rarely do they keep you both warm and dry. The Castelli Nanoflex Bib Tights break the mold by effectively doing both. By adding a proprietary, water-resistant coating to one of Castelli's most warming fabrics, the Nanoflex bib tights offer an all-winter edge that will keep you out pedaling.

The Castelli Nanoflex Bib Tights are made from the Castelli exclusive Nanoflex fabric. Nanoflex is a water-resistant version of Castelli's ultra-warming Thermoflex fabric. The transformation process occurs when the Thermoflex fabric is coated with millions of nanofilaments to create a water-repellant surface. Water beads and slides when it comes in contact with Nanoflex, and all the while, the Nanoflex Bib Tights retain their warmth and wind-blocking prowess. Besides protecting you from rain and snow, the Nanoflex Bib Tights give you the benefit of having lightweight, stretchy bib tights that warm like a light jacket on your legs and fit like you're off to the races. The Nanoflex also features a fleecy inner-lining that traps a layer of warm air on your skin while it wicks away moisture to the quick-drying Nanoflex surface. This process provides a consistent warmth and dryness that you'll appreciate when it's in the 40s. The Nanoflex adds extra comfort by incorporating breathable mesh bib straps and the Kiss 3 pad. The Kiss chamois uses a seamless construction of brushed microfiber to avoid any chafing, and the pad is anatomically shaped to follow your movements. The Kiss 3 also features a variable density design with more padding where you need it and less where you don't.

The Castelli Nanoflex Bib Tights are available in six sizes from Small to XXX-Large, and in the color Black.

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

Tech Specs

[body] NanoFlex, [straps] mesh
yes, Kiss3
Claimed Weight:
298 g
Recommended Use:
Manufacturer Warranty:
30 days

Size chart


Men's Apparel
 Small Medium Large X-Large 2X-Large 3X-Large
Chest  35.5 - 37in
(90.2 - 94.0cm)
37 - 38.5in
(94.0 - 97.8cm)
39 - 41in
(99.1 - 104.1cm)
41 - 43in
(104.1 - 109.2cm)
43 - 45in
(109.2 - 114.3cm)
45 - 47in
(114.3 - 119.4cm)
Waist 29.5 - 31.5in
(74.9 - 80.0cm)
31 - 33in
(78.7 - 83.8cm)
33 - 35.5in
(83.8 - 90.2cm)
35.5 - 37.5in
(90.2 - 95.3cm)
38.5 - 40.5in
(97.8 - 102.9cm)
41 - 43in
(104.1 - 109.2cm)
Hips 36.5 - 38.5in
(92.7 - 97.8cm)
38 - 40in
(96.5 - 101.6cm)
40 - 42in
(101.6 - 106.7cm)
42 - 44in
(106.7 - 111.8cm)
44 - 46in
(111.8 - 116.8cm)
46 - 48in
(116.8 - 121.9cm)
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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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.

Avg. ride time: 2h 46m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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

Responded on

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.

Responded on

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

Responded on

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.