Chamois School 201
Hello, class! And welcome to the next session of Chamois…
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Hello, class! And welcome to the next session of Chamois School. There tends to be a lot of confusion about what makes a great chamois and why they are so important, even to some experienced riders. I used to be one of them. You can bunny-hop over and read Chamois School 101 if you missed it. CS201 is a bit more detail on the bits that protect your bits so you can enjoy the ride.

Just so we’re clear, our men’s and women’s chamois are developed in parallel but are two separate engineering processes. Pearl Izumi doesn’t just change the shape of an existing chamois to make it a “women’s specific” version. A similar process of design, testing, refinement, and the resulting product takes months and even years to complete. There is no skimping to have both versions. This is important to us because it’s important to you. Now, let’s talk some details.

Super thin pressure sensors are mounted on bike saddles to map out where pressure is on the human anatomy.
A closer look at the sensors we use to map out the pressure points on various saddles.

Kind of like the foundation of a building, the chamois is the beginning of everything we do when it comes to cycling apparel. When considering how to design a chamois you first need to know where to place the support for a rider in the first place. You wouldn’t just throw a chair pad from the dining room under your tush and pedal down the road. We needed to find out what was going on between the rider and the saddle. By using specialty pressure mapping sensors beneath riders on more than a dozen saddles, regardless of brand or style, our engineers are able to determine the highest points of pressure for male and female riders. Knowing which areas require the most support allows us to start with the most important areas and work from there.

Using that map, we are able to work with our chamois manufacturing partners of nearly 30 years to compose prototypes of single and multilayer foam. The ideal chamois will provide the right amount of support without losing that “ride feel,” that most experienced riders come to expect or add bulk to give you giant diaper. A thicker foam may not necessarily mean more comfort. It’s about having the right density of foam for that ideal support and the resiliency to endure the amount of time you’ll be riding. That is why we have multiple levels in our bib and short lines. The P.R.O. chamois has the best level of breathability, stretch, and resilience for those epic rides. While the ELITE level is still some of our best technology for breathability they come with a little less density in the foams to provide a plush ride for long rides. And the SELECT level is great chamois for those shorter rides that still require maximal function on the bike while not breaking the bank.

Pearl Izumi is one of the only apparel companies in cycling that is using a unique reticulated foam that provides the necessary breathability–let’s be honest it gets interesting down there on a hard ride–and the needed foam density to ensure the proper ride function. Many other brands’ chamois are a cocktail of foams and bonding processes that may end up sacrificing either breathability or foam resiliency. It’s taken us years working through hundreds of prototypes to get to our current recipe for success.

In addition to the right foam suspension, the best chamois needs to have exceptional wicking and breathability from the surrounding fabrics. Our unique top-sheet inverts the conventional chamois design and provides a completely smooth “floating” surface to your skin. The ability to sew the top and bottom layers only in the front and back of a chamois allows for the top-sheet to “float” and find a natural position against your body eliminating bunching and wrinkles. Say goodbye to chafing and even chamois cream. Seriously. Chamois cream can actually clog the natural holes within the foams and reduce breathability. Let’s not get into those kinds of details this time, that’ll be next time. The P.R.O. level chamois even have a special finishing treatment on the top-sheet to improve the wicking of moisture away from your skin. Wet skin leads to a few issues, including increased friction which can lead to some pretty uncomfortable situations–from chafing to saddle sores. It’s no way to have to ride and it certainly won’t be comfortable.

After all that thought and theory about where the foam should be and how much of it there needs to be, we make a small run of prototypes. These wannabe chamois will be stitched into shorts or bibs for some legit testing. Leveraging our wear tester program to confirm ideas that may look good on paper or on a screen takes hundreds of hours of ride time and a deep database of documentation. Those testers are active cyclists from a broad spectrum of styles and abilities so that we can be sure to make designs and improvements work as needed for the desired riding style. Sometimes testers come back to us and really dislike a prototype, sending us back to the drawing board. And that’s okay, we like honest feedback during development. A small number fall under the category of refinement, where an existing design just needs some improvement and added features or technology. After there is a majority of approvals on a prototype design from our ride testers, we will then work our way through the process of larger production runs that eventually end up on and your local bike shop. And we’re so confident in our process we offer a limited lifetime guarantee.

So there you have it. Hopefully, a better understanding of what that oddly shaped thing in the shorts is all about and how our versions are different. Never forget, a bad chamois can ruin the best ride. It’s a very important bit within your shorts to protect your bits so you can focus on the ride.

Be on the lookout for the final installment, Chamois School 301, in a couple weeks. We’ll talk about how to take care of your new fancy chamois and some other tips to keep them at their best.

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17 thoughts on “Chamois School 201

  1. What a poorly written article. I really wanted to come away with knowledge of which chamois to get . There are so many models in different places and no clear indication of which one I should get for my type of cycling. It’s a jumbled confusing mess. I still don’t know which is “the best”.

  2. I have gone through all the chamois and suggest you buy the “ Pros “ because you’ll get there anyways. They are great!

  3. Really! Mr. Goldfinger you can’t even understand the simple drawings above? with only 3 and yes 3 to pick from… Maybe if you stated what type of riding you do someone could help you… Just saying:)

  4. Although it wasn’t within the scope of this article, it would be nice if Pearl Izumi would either choose logical names for their lines or publish a listing similar to the one in Chamois School 101 on their web site. My wife wonders whether “Sugar” or “Escape” is for longer rides. I think we could figure the progression for “Select”, “Elite “ to “P.R.O.” and after a couple of years, thanks to the chart in Chamios 101, I now understand “Pursuit” versus “Escape”. I assume that “Sugar” doesn’t apply to men’s. The Marketing Department needs to get beyond sales to include logic.

    • That is a reasonable point, Steve. We are always working to streamline the naming conventions and improve how we talk about our products for better clarity. If riders don’t know or understand the potential use of a piece, why would they be interested in it? Sugar is for women-specific pieces and is predominantly shorts (there are some tops with the name too) with a slightly shorter inseam than the rest of the women’s line. If you ever have any questions, feel free to fire us an email at and we’ll be happy to help you out. Thanks for the comment. Ride on!

    • The Sugar ‘bottoms’ lineup for women all have the ‘Select’ chamois in them. Of all our chamois available, the Select has the lowest amount of support and no-antimicrobial top sheet. It is value priced – and compared to other competitive products at this same price it performs remarkably well. If your wife is looking for a longer-distance short, I would recommend the Elite or Pro products. Choosing between Escape (endurance) or Pursuit (competitive) is preference. Escape materials will have more freedom of movement, softer against the skin, and typical inseams are standard 8″ for women. The Pursuit materials will have more compression, maximum moisture management, low bulk, and inseams are typically an inch longer 9″ for women.

  5. Please include a picture of the chamois with the shorts/bibs, etc. It would be nice to know exactly what you’re getting.

  6. I’d like to be a tester. Last year I rode 11,503 miles. This year I’ll do at least 12,000 miles, and 20 centuries.

  7. How is it possible that the thickness in MM for ANY of your shorts is not advertised???? How do you sell bike shorts without that knowledge??????????????? This is crazy!!!!

    • Hi Daniel,
      Thanks for sharing your feedback. One reason we haven’t typically included that info is that you can measure it on a table but that once you put it into a chamois, put the bibs/shorts on, and then sit on a saddle the thickness is going to be completely different in different areas. The other main reason is that our open cell foams are comprised of different densities so they will have different thicknesses on or off the bike as well as between the different levels of chamois (PRO, ELITE, and SELECT). It’s possible to make a thick chamois using softer foams that feels the same as a thinner chamois employing higher density foams. In looking at a few other brands’ product pages, they don’t include a thickness measurement either. Sorry, that info isn’t available for you, we have chosen to omit it because of the variability potential.

  8. Sadly, I agree with several of the comments above, but appreciate that you do answer the comments. I am looking for the right chamois for 100+km road rides where I would like to spend more time in the drops if I had a more comfortable chamois. I love my Pearl Izumi jersey and would love to team it up with the right shorts. It would be very helpful if perhaps you had a selector on your site that asked for input as to average length of ride, type of ride, casual or race, etc. Then it would be so much easier.
    I get the difference between Pursuit [road] and Escape [off road], but then got confused when it claimed that the PRO Escape 1:1™ Chamois is in all PRO shorts. But isn’t Escape for offroad…..still confused. Please help, thanks

  9. I am truly confused on which shorts to pick. My time is most valuable to me and don’t want to spend hours figuring this out. A chart for Select, Elite, PRO, quest, pursuit, attack, escape etc. would be nice. For now, sticking with what I know — Castelli, even if I have to pay more, as time is the most valued asset I have.

  10. Hi,
    I agree with all of the comments above. Typically, as a long-time long distance woman rider on steel bikes (also daily commuter 20 miles, cycle “tourist”, and all non-competitive riding in between), and a very good stiff leather saddle (no, not Brooks, as those sag), the only reason I need bibs is to avoid chaffing and too much/fast heat-buildup, not to “cushion” my cute ass against road buzz… I had used for many years the alas defunct Pearl Izumi 80s “thin” chamois shorts and whilst they had their problems (bunching in the center when wet was one) I had to stop buying PI when they started making “padded” cushion shorts, along with the trend, as those were just too painful on long days endurance rides… As I really appreciate what PI is trying to do to with women cycling, and especially with bibs, its research and dedication to cyclists, would you furnish, on your website, a precise description of the chamois you offer as, again, I need saddle feel, no “posh” digging in under the labbia, anti-chaffing bibs – not the “best”, “middle” and “great” description – I could happily become again a loyal customer…

    Your answer on not providing thickness (because of various densities, weight of riders, some others not providing the data) is not enough it seems to me: why don’t you just provide densities, also, then?

    • Hi Cecile,
      Thanks for your comments and questions. The thinnest chamois in our line is the Triathlon chamois, which is super thin and is designed to prevent chaffing and that’s about all. There is no support with the tri chamois. The SELECT chamois would be our thinnest true chamois in the line made of single density foam. Maybe one of those would serve the purposes you are looking for. Not every rider has developed the ability to ride comfortably as you have over the years of adaptation. We work to develop apparel for the widest range of riders we can, knowing that we won’t be able to get it right for everyone.
      Thanks again. Enjoy the ride out there.

  11. The worst written infomercial ever. Just give us the name, and differences in construction, the dimensions, and the fabric combinations.

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