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  • Castelli Endurance X2 Short - Men's
  • Castelli Endurance X2 Short - Men's Back
  • Castelli Endurance X2 Short - Men's Chamois
  • Castelli Endurance X2 Short - Men's Detail
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CastelliEndurance X2 Short - Men's
Sale 27% Off$94.98 $129.95

Item # CST000F

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Item # CST000F

Enjoy your rides.

Your long rides are hard enough without continuously squirming around in the saddle as you try to find a comfortable position. Castelli has taken its X2 chamois and placed it into a short that will have you riding farther than ever before, in more comfort. Its Endurance X2 Short has all the features of the bib short of the same name sans the bibs. 

Castelli constructs its shorts from the inside out. It starts with the chamois and builds from there. In the Endurance shorts, the insert you sit on is Castelli's Progetto X2 chamois. It's a three-layer stretch pad. The top layer is soft and seamless bacteriostatic polyester fabric that wicks moisture away from your body. Underneath the top layer is a perforated viscous comfort pad located directly under the sit bones and the perineum to neutralize those high-pressure areas. The final layer has variable thicknesses. It's micro-thin at the edges and increases in thickness en route to the thickest area, under your ischial tuberosities.

To keep them from riding up, the Endurance Shorts feature the Giro++ leg gripper. This is a single-layer gripper that integrates gripping material into the fabric as the shorts are being made, so you can barely feel them even though they hold firmly. This technology is pretty cool; they've taken 43% Lycra content fibers and stitched them inside PowerLycra, which is 24-28% Lycra. As you stretch the material, the 43% fibers start to appear on the inside of the legs openings. Giro++ grippers are soft and rubbery and grip great.

The body of the shorts have been simplified. They use an eight panel design to wrap around your body. The front and rear panels are made from Action PowerLycra, which is highly abrasion resistant. The fabrics has been given Castelli's Prosecco treatment. This is a treatment that helps water disperse and evaporate faster, rather than staying in the jersey. The side panels are made of Energia LycraPower. It stretches more horizontally than vertically so it offers good muscle compression. The ribbed knit surface also helps a bit with aerodynamics. An elastic waist keeps them in place. The shorts are perfect for riders who don't like the feeling of bibs on their shoulders. But, if you like the added coverage provided by bibs, take a look at the Endurance X2 Bib Shorts.

Four-needle flatlock stitching prevents chafing and helps maintain the compression. 

The Castelli Endurance Bib Shorts come in Black. They come in sizes from Small to XXX-Large.

  • Giro++ leg grippers
  • Power Lycra construction
  • Progetto X2 chamois
  • Flatlock stitching
Tech SpecsSize
Tech Specs
Endurance Evolution
Progetto X2 Air
Leg Gripper
Recommended Use
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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Poorly designed cuffs on legs

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

Purchased a pair in 2018 after two rides the liner around the legs separated. It is not sewn on it used some sort of adhesive and separated quite easily. Shorts still useable but questionable quality and actual longetivity for a product so expensive.

Comfortable once I got it on

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

Man, the legs on this thing are tight. I could barely get them over my not very muscular thighs and was surprised I still had circulation. But once that battle was over, the shorts were quite comfortable all day long. The chamois is excellent.

Fine quality - strange chamois placement

  • Fit: Runs small

Castelli quality, but middle of the range padding quality.

Somehow the chamois always feels like it's in the wrong place when I ride with these shorts... a little too far forward, resulting in soreness on long rides. I don't have this issue with shorts or bibs from Pearl izumi or Assos.
Would recommend for riders doing <40mi on a budget, but choose something else for longer rides.

Castelli - great stuff

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

A nice short with a nice looking pad, but two sizes too small! I ordered up one size to large based on other reviews, but ended up needing an XL! I'm 5'8", have a 32" waist, and weigh 160 pounds. XL? Nice fabric, a bit of a low rise waist compared to Pearl Izumi, but the pad looked great. Trying again because I love my 10-year old Castelli shorts!

Nice chamois, too small

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

These shorts have a nice chamois in them. Even after ordering up a size to XXL, they’re still far too small. They sit low enough below my belly button that it’s uncomfortable and would be potentially embarrassing in public. These will become trainer shorts only.

Great shorts!

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

These are very comfortable shorts on long rides.(50-60 miles)
Unfortunately I had to return my first pair because even though I ordered one size larger than normal they were still too tight. Had to go up two sizes to get them to fit correctly.

Great chamois in these shorts.

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

I'm in to bike packing, so I do some long rides with hours in the saddle. These shorts are great for endurance rides. They are small...I'm pretty sure they are from Italy, and Euro stuff runs small. I'm 72 inches tall and weigh about 195...XXL fits me fine. I usually wear a L, both top and bottom.

Oh man are these small

  • Familiarity: I returned this product before using it
  • Fit: Runs small
  • Size Bought: XL

I'm XL and ordered XXL and they're too tight still, as I'm just a few pounds heavier than lean. These shorts are also very low rise, so unless you are super lean, you're going to get spillage.

Tight is right

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

I rolled the dice and went by the size chart and ordered a Medium based on my 31.5" waist. I learned from my size small LG Carbon 2's (which are fabulous except for the one horrendous design flaw) that a tight fit is essential to the pad fitting properly and staying in place on long non-stop rides. Maybe I could wear a large X2, but I don't even know I'm wearing the mediums. Consider them a half size small if you're sitting on the fence. If you don't like a skin-like fit then I'm not sure how you'd interpret the size chart. They don't have the springy skin-like tight fit of the LG's fabric, but they're still very comfortable, and the hems stay put. X2's are more of a compressive fit in an invisible sort of way. I've only done 2 hrs at a time so far in these, but the pad feels great, and I expect it will be so on rides several times longer. One design element that I've never run across before is the low rise in the front. The waist is over 3" higher in the back. The front is over 2" lower than my LG's and over an inch lower than my size medium PI Elites. The purpose is obviously to place the edge of the waist across the front of your pelvis instead of the bottom of your stomach so it doesn't bind or roll over when you bend. It felt weird at first but is more comfortable in the bike posture. Speedo guys won't notice it. On the other hand, there's the possibility of serious sizing issues that are unrelated to your waist size depending upon how big your pelvis and hips are. My hips are 36" at the widest, and I'm 34" where the top of the shorts ride. Also, in case you're accustomed to your shorts smoothing the transition from your belly to your groin, the X2's do just the opposite since the low-rise waist in the front is probably going to run right under your belly and accentuate the transition. I put these in the same outstanding category as the Carbon 2's, but with a completely different fabric, and minus the bizarre design issue of the LG's.

Best shorts

  • Size Bought: XL

Progetto X2 pad is very comfortable over long distances (50 miles+). Tried these shorts, got another pair, then a third for a buddy's birthday. Both of mine were in the wash last week, so I reverted to a top pair from another brand I had - there's no comparison. Do your ischial tuberosities (sit bones) a favor and buy a couple pair. NOTE: mens run small. I'm 34 waist 165 lbs., large in Pearl, XL in these. My wife says womens are true to size. Happy cycling!

run smalll but great shorts

  • Fit: Runs small
  • Size Bought: XXL

i bought and returned these shorts twice hehe, i usually wear Large, the XXL is the one that ended up fitting me well. its a great short, super comfortable, the chamois is very thin but WORKS. it breathes amazingly, i wear pearl izumi as well, and when i ride with pearl, i feel sweaty down thre, with this guy it's nice dry and airy.. great shorts, love the grips on the legs as well.

Great shorts. I will buy again.

  • Fit: Runs small
  • Size Bought: Large

They are the high quality to be expected of Castelli products. Very comfortable due to the fit which is stretchy and a very nice chamois. They run about 1/2 size small. I am 5'11" and 154 lbs so the L is perfect for me but it is tighter than my other Castelli shorts/bibs.

Ultra lightweight, great for long rides

  • Fit: Runs small
  • Size Bought: Large

My first Castelli purchase. Very happy with the quality and comfort on long rides. The fit does run small as one reviewer commented. May be good to buy one size larger.

Great shorts

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: x-large

I love these shorts. They are stretchy and conform to my body. They are also very comfortable in the seat.

Nice shorts, but leave you wanting more

  • Familiarity: I've put it through the wringer

I started purchasing Castelli cycling shorts this year when Louis Garneau stopped making their Mondo Evo's available in a short (verses bib), so most of my observations are in comparison to those, which are super nice in every way. Castelli makes great products, but the Endurance are a mid-point in their overall line. I also own a pair of the Castelli Aero Free shorts, and by comparison, the Endurance feels heavy and more constrictive. The leg cuffs are much stiffer feeling than the Aero Free. The chamois is the same between these two Castelli shorts, but even though these shorts are labeled Endurance, the Aero Free's feel more comfortable to me on longer rides. Some people have said that these shorts are too small, and I agree. I had to get an XL, where I normally wear a large. I even wear a large in the Aero Free, so figure that one out since it's the same manufacturer. The bottom line is that the Endurance shorts are adequate, but I wouldn't buy another pair. Spend a little more money and get the Castelli Aero Free or LG Mondo Evo's if they become available again.

Best shorts I own

  • Familiarity: I've put it through the wringer

These shorts are worth every penny. I don't wear anything else. They do run about a size small. I'm 160 lbs with a 32 waist and I wear a large and not a medium.

Great shorts!

  • Familiarity: I've used it several times

I'm 5' 8" and 150 lbs. Size medium fits great. Very comfortable shorts on rides of 50+ miles. A little pricey, so buy them when they're on sale.

The sizing is a joke.

    I am 5'11" and 180lbs. l ordered x-large and these shorts couldn't fit a nine year old girl. Don't waste your time

    I'm 5'10" and 155lbs., and the x-large are still pretty tight on me!