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Castelli Endurance X2 Short - Men's


Item # CST000F

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  • Black, S ($129.95)
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  • Black, XXL ($129.95)
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Item # CST000F

Long-ride specialist.

The Castelli Endurance X2 Short starts, perhaps unsurprisingly, with the Progetto X2 Chamois. This is Castelli’s top-line, three-layer pad designed to support your sit bones and resist chafing, no matter how long the ride. Sewn around the X2 are eight panels, two of Action PowerLycra for abrasion resistance in the seat area, and the remainder of Energia LycraPower, which is designed to support your muscles with a lightly compressive fit.

  • Giro++ leg grippers
  • Power Lycra construction
  • Progetto X2 chamois
  • Flatlock stitching

Tech Specs

Endurance Evolution
Progetto X2 Air
Leg Gripper:
Claimed Weight:
[size L] 5.96 oz
Recommended Use:
Manufacturer Warranty:
1 year

Size chart


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
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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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.

Avg. ride time: 1h 13m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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!