The material used in these shorts is the best of all the shorts I own. The pad is good too, but its the quality and feeling of the material that really stand out.
I have a 32-33 waist and am a solid medium everywhere else. In these, the L waist was a little snug at first, but fine. The cuffs are also a tiny bit loose, but its no big deal.
Wow! For me these are the most comfortable shorts I wear. I have migrated over to bibs (for me even more comfortable), but these shorts make my rides comfortable and more pleasant. Castelli stuff does run seem to run SMALL. I order one to two sizes larger than typical US sizing standards. For example, a medium Pearl Izumi short fits me like an extra large from Castelli. Castelli is now my brand of preference. I highly recommend Castelli and I will be buying more of their cycling kits.
I have found the Castelli shorts to be far more comfortable than others I have worn. They do run about a size smaller than others. These provide more compression on my legs which helps on longer rides.
I started with a medium, which I wear in some brands, but exchanged them for an XL. Those were still too small, and I didn't even think that the largest size available (XXL) would fit so I returned them. Other than that they were very well made, stylish, and were delivered on time. i wish they would have fit...
The are by far the best bike shorts that I have owned. They are comfortable appear durable. The fabric is a little different than my normal shorts but I like it better. Definitely go one size larger. I am a solid medium in everything else but a large in these.
Today I have just completed riding the entire Natchez Trace National Parkway. 450 miles in 6 days. I wanted shorts that I could wear all day in comfort, and these fit the bill. I own Castelli shorts so I knew to size up, I usually wear a M so I ordered 2 pair in Large. I wore a pair on a training ride and quickly realized they were too small. I am 5'10 and 168 lbs. I quickly called Biketiresdirect and they rushed 2 pr. of XL and after I tried one on, I returned the large. These are awesome shorts and I really appreciate the service I received. My trip was great- perfect weather and no complaints from my 61 year-old body.
I am 6 ft. tall, 190 lbs, and have normal body proportions. These shorts run a size too small. They are tight in the legs, but not too tight for cycling. The chamois has a nice feel for extended rides, but I don't think it comes up quite high enough in the front. My main dislike is that it is shorter at the waist than it should be. I have to make sure I wear one of my longer jerseys unless I want my stomach to show.
I bought a pair of these shorts and then immediately went out and bought another pair of them (bib shorts style). So comfortable on long training rides or centuries. I also like the way I look in these shorts. Better value with comparable comfort to Assos shorts. Unique chamois is the key to the comfort of these shorts. The fit is snug so if you want extra room in the shorts, you may want to order a size larger. I like the snug fit on my legs but others might like it a bit looser.
The best shorts I own, including a slightly different Castelli design. Bought them a couple of weeks ago. So far, used them on rides of 25, 65, and 75 miles. Not sure what all those different panels and fabrics are for, but they add up to an excellent fit. The chamois pad isn't real thick but it works just fine and stays in place. As others have noted, order at least one size larger than usual.
Weather for the last ride was fairly warm by Puget Sound standards - high 80s. Jersey and shorts were completely soaked. Shorts were very comfortable.
Expensive, even with the BTD sale price, but worth it.
Good quality bike shorts (and bibs) are hard to find. I am glad I found the Endurance X2 shorts, I have several pairs. I think they are the best no-butt-lube shorts out there. Hopefully they'll keep making them and find and replace them with something better !!