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CastelliLW Bib Tight - Men's

Temporarily Out Of Stock

Item # CST00IU

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

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For winter's warmer days.

Winters have slowly but surely been on their way to becoming unseasonably warm. In a matter of years, some of our favorite burly winter layers have become obsolete when Old Man Winter just isn't dealing the same big blizzardy blows to us that he used to. Castelli brings to the table the new LW Bib tights as the right option for cool conditions when winter isn't harsh enough to justify breaking out your burly, softshell-paneled tights, but you still need supportive warmth that takes the chill off of your skin.

Sometimes you have to pick and choose between warmth and support, but Castelli starts this bib with the tried and true Progetto X2 Air chamois to support you from the bottom up. Multi-density foam is layered with 4-way stretch seamless fabric to create a supportive base, and variable thickness with perforated inserts to set you up for hours in the saddle. With ample sit bone support, the chamois offers you the relief you need for hours in the saddle, and excellent moisture transport to wick away sweat ensuring dry comfort on long rides.

With elements on the Castelli Omloop bib shorts, the upper portion sees offset seams on shoulders for reduced chaffing, a mesh back panel for breathability, and wide, flexible straps to disperse the pressure. The mesh back panel is ideal for keeping you comfortable, since it enables you to regulate your temperature by opting for appropriate base layers, rather than being forced to roll with heavy insulation when you don't need it.

Moving down from the top, we're happy to find the same Thermoflex fabric that we've seen before on Sorpasso bib tights, with its soft and fleecy backing that feels great against the skin, and gently stretching threads that hold us in. Unlike the Sorpasso, the LW bib tights don't feature Thermoflex Core2 panels, which saves both in weight and heat, but that doesn't mean there isn't anything repelling the elements on the LW.

Because staying warm is best done by staying dry, lower panels on the legs are made up of Castelli's Nano Light fabric, which offers protection from water and wheel spray. Nano Light is unbrushed, unlike the Nano Flex, and has a tighter weave to keep out more moisture. Since it's a little bit heavier than the Nano Flex, it also provides more warmth, making it ideal for cool weather while providing your calves with a smooth hug of muscle support.

  • Lightweight bib tights for dipping temps
  • Soft and cozy Thermoflex upper panels keep you warm
  • Lower leg fabric lets water and wheel spray roll off
  • Unbrushed calf panels with tight weave support your muscles
  • Multi-density chamois comfortably supports sit bones
  • Control your warmth by layering underneath mesh back panel
  • Smooth bibs with offset seams reduce chaffing
Tech SpecsSize
Tech Specs
[upper] Thermoflex (86% nylon, 14% spandex), [lower panel] Nano Light
Progetto X2 Air
visibility stripes
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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Phenomenal. Especially for the Price.

  • Familiarity: I've put it through the wringer

Quality chamois, warm down into the 30's. What more can you ask for?

Very Versatile Tights

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I've worn these in a few different types of conditions. I think the right temps to wear these are 40-55 degrees F in good conditions and because they offer a little more warmth and some protection against damp weather (though not heavy rain) 45-60 degrees in windy, misty conditions or if you are planning to hit some gravel with some muddy sections as the lower parts around the ankles shed water well. I've worn them on days as warm as 65 without any issues as well.

For chamois is really comfortable for me and I like the fit of the small. It keeps everything in place and for short, skinny dudes like me I wouldn't want them any bigger; but for reference I dislike the way Pearl Izumi stuff fits as the length to waist ratios are off as they fit too wide for their length

Way too small

  • Familiarity: I returned this product before using it

Ordered this in the size I wear in many other product but fit like I was trying to get on an item that was medium and not the extra large I ordered. Could barely get it on much less even use it. Very disappointed.

Pretty nice if you can get the right fit

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

i'm 5'9, 145. 32/30... run medium in most bibs. Tried the med - way to small. Tried large - still too small. I returned both. One critique is the chamois is cut pretty low in front. I don't know if this is normal or not and isn't a mark against the functionality of the bibs, just not what i am used to.
Overall, they are pretty nice and the quality seems like its there, you should not be disappointed as long as you can get the right fit.

Great bibs

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: Medium

I love these bibs. I have ridden in these on days much colder than they recommend and was fine without getting chilled. They do run a touch small and I could wear either a medium or large in these.

Great Piece of Kit

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

These tights are GREAT! I bought a XL but a L would have been perfect. I wore these in 40's with a slight wind and was very comfortable!

Short round dudes read this review.

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

I own a lotta castelli bibs, and have had one other pair of tights. These Definitely runs small (typical for castelli). im 5'5" and a 192.5 lbs with big thighs and butt. I went with a medium. Fits my 34" waist fine, but is like 2 inches too long. There's no way a small would fit. Such is life when you are short and kinda chubby.


  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: Medium

You can never go wrong with Castelii. Product runs small. I orderd ome size up.

Warmth without overheating

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Small

These bibs are sweet. For those cold days out on the bike with a long list of intervals ahead, this piece of clothing will keep you warm, but you will not overheat. It truly is perfect for those cold days and hard efforts. There is nothing worse than overheating and sweating on a cold day. That doesn't happen with these bibs. Given you are not riding them on a warm day. These are perfect for those cold days. It pairs well with an Alpha Ros Light jacket.

Small??? Are you blue down there after using these?

So the bib straps are not too tight on your shoulders, at 6'2" with a size small?

decent quality--small fit for tall folks

  • Fit: Runs small
  • Size Bought: XL

I'm 6'3, 170 lbs but an XL was too small--the bib straps don't reach my shoulders which pulls the whole bib very tight. I'll give XXL a try! I have a 31 inch waist and 35'' inseam.

5 star

  • Familiarity: I've used it several times
  • Fit: True to size

I am always a Castelli fan and have a couple of their bib tights now. Fit is typical Castelli, it's on the small side but if you wear Castelli it will be the same as you've done. Fleece lining is very nice, well constructed and comfortable on the bike while riding. I have been out so far in these in temps from mid 30's to mid 40's. For me over 50 would be a little warm, and I just don't like to ride under freezing temps. In my previous tights the lettering has started peeling fairly soon, these have not yet but I kind of expect it to. It's not a big concern as I'm more worried about the performance. The straps are comfortable and the chamois is probably my favorite out there, The ankle opening doesn't bind or irritate in any way, very nice, as I've worn some that are not as good. I would definitely recommend them. feel free to hit me up with any questions, kylebrown@backcountry.com

5 star

Are the ankle openings ultra-stretchy? I usually hate tights without ankle zippers. I'm size medium in Castelli, with size 10 feet and narrow ankles.

How tall are you and what size do you wear?

warm enough, not too hot

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I love these bib tights. With tights I've used oriented toward colder winter cycling, I've had the issue of overheating, poor moisture wicking, and material bunching. With the LW, all of these problems are absent.

Here in the dry Utah air, I've ridden in temperatures ranging from the high 30's (about 3 C) up to the high 50's (14 C or so), and have found the sweet spot for these bibs to be anywhere between 40-55 degrees F (about 4-13 C).

The chamois used here is Castelli's best chamois, the Progetto X2. Very impressive at this price, and this piece doesn't feel like a pricepoint-oriented garment at all. If I have one small complaint, it's the printing that serves as a tag sometimes sticking to my back, right between my shoulder blades, when a lot of sweat is present. That being said, it's not enough for me to deduct a star.

Sizing is pretty true to most Castelli bottoms. The XL fits me well at 6'3

warm enough, not too hot

6'1", 165-168lbs, 31-32" waist, 33-34" inseam. I wear a Castelli San Remo 3.2 Speedsuit in a Large, and it fits as a race kit should, snug. Should I move up to an XL in this bib tight, or any Castelli bib tight for that matter (e.g. Sorpasso Wind bib)? Thanks.

Like Kevin below, I'm also 6'1", but 178 lbs, 33" waist, 33" inseam. What's your guess about whether a L or XL would fit better? Thanks much,

Right Tights

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

Living in a region that demands cold weather gear to ride in the Fall and Winter I have found the LW TIghts to fulfill the requirements of a versatile tight . The chamois is the same as you will find in Castelli's Free Aero Race, while the Thermoflex upper and Nano Light on the lower leg offer a great combination of insulation and protection. I have ridden these down to the mid 30's and up to the mid 50's without being uncomfortable. Fit is unmistakably Castelli with a very close, yet mobile feel, even on a mtb or cx ride.

Price to performance ratio - 10/10

  • Fit: Runs small
  • Size Bought: S

You know those $300+ bib shorts Castelli and David Millar worked on together? The Chpt. IIIs? Well yeah, these bib tights have the exact same chamois. That means while you're suffering during the Fall and Winter, your undercarriage won't be crying out along with your legs. Personally, I can wear these down to right around 40 degrees, although I definitely run very hot. I won't usually put on arm warmers until its 55 degrees max. These tights are fleece lined, which includes the front of the bib straps, a nice touch. The lower leg is a thin, breathable, windproof material which keeps you a lot warmer than you would expect from the paper thin material. The fit is also perfect on me, skin tight everywhere, which means it definitely runs on the smaller side.