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Men's Foundation Bib Short

95 % of 100
Think of Foundation as a base layer for your lower half, an innovative bib short, designed to deliver maximum freedom of movement, comfort and ventilation beneath baggies.

Have a question? We'd love to hear about your next adventure.

Model is: Height 6’3”, Hip 37”, Thigh 21” and wears a small.


Constructed with an airy, open mesh and a unique Force platform chamois finished with a front cut-away to relieve heat build up around sensitive areas, Foundation drives massive amounts of airflow, all while laying down a level of comfort equal to 7mesh standalone bibs.

For extended expeditions, Foundation features three large back pockets to complement storage on the bike and free up space in your outer short’s pockets.



  • Body: 78% nylon, 22% elastane
  • Contrast: 77% nylon, 23% elastane
  • Chamois: Elastic Interface Mens Performance Force (Made with recycled content)


  • Men’s: 168g


  • Three large jersey-style rear pockets
  • Highly breathable open mesh
  • Mens Performance Force chamois with innovative front cutaway for breathability
  • Clean cut hem with silicon gripper
  • Reflective logo


  • X-Small: 7 1/2” - 19.1 cm
  • Small: 7 3/4” - 19.7 cm
  • Medium: 8” - 20.3 cm
  • Large: 8 1/4” - 20.9 cm
  • X-Large: 8 1/2” - 21.6 cm
  • XX-Large: 8 3/4" - 22.2cm

Care Instructions

  • Machine Wash Cold in a wash bag to prevent damage from velcro/zippers etc
  • Do Not Bleach
  • Do Not Iron
  • Hang To Dry
  • Do Not Dry Clean
Crash Replacement

Crash Replacement

Hit the hills and go full out on the flats without worrying about keeping the rubber side down. To ease your mind and stay focused on the ride, we offer a Crash Replacement Policy.

Skin Fit

Skin Fit

Products that blend performance fabrics with highly articulated patterns to create a close-fit that feels like an extension of your body. Skin Fit apparel improves aerodynamics, moisture management and thermal efficiency.


Product Reviews

  1. David

    Comfortable and airy

    The bib shorts fit spot on. They were very comfortable and very airy in the summer heat. The pocket on the back can be a little difficult to reach if you do not have good shoulder mobility
  2. Will

    Good not great

    Chamois is pretty nice but straps are awful, too narrow and tend to bunch up which irritates. Straps are made of same mesh material as the rest of bib and while it breathes well, it doesn't hold shape or offer the stretch of normal bib straps.

  3. Rush

    Exactly what I’ve been looking for

    I’ve been searching for something I could run under baggies and road bibs as under-shorts were not cutting it. The Foundation bib is super light and well vented with a surface that holds on to your baggies - ie: no more diaper-feel or baggies shifting around. I’ll be getting another pair. And ...

  4. Hutch

    My Long Ride Companion

    I had no idea what I was putting myself through until I had rode for 6+ hours one day and my bottom wasn’t sore at all; really gets the job done. The cushioning is just right and the mesh material is extremely comfortable even when it’s 80+ Out. This bib is an excellent partner for endurance ...

  5. Brian

    Light and Comfortable

    Bought these about a month ago and have been extremely happy. They fit great and are very light under my baggies. The rear pockets are easy to access and hold everything I need them to. The chamois is comfortable but not too thick or big. Will definitely be adding another pair to the rotation in ...

  6. Brian

    Great fit - crazy comfortable

    Ordered a pair of these a couple weeks ago. Love how light they feel and they are really comfortable. Looking forward to putting a lot more miles on with these. Will definitely be getting another pair.
  7. RH

    Love the pockets

    Well made, pockets on bibs are the best. I’m usually either XS or S for most brands, XS fits me nicely
  8. Mike

    Solid Base Layer Bibs

    Great base layer bibs for those who ride long days. Whether it's fun rides, workouts or racing the pockets allow you to carry carbs, mix, etc with easy access. The mesh build also offers great cooling/ventilation while still being comfortable. Solid option!
  9. Kyle


    In short, AMAZING! Lightweight, cool and comfortable. I can ride until my legs can't. No more saddle issues with these bibs. Get some!!!
  10. CMH

    Awesome MTB Bibs

    Just got these and immediately used them for a week of riding in Golden. I wore them for everything from 50km rides with lots of elevation to shuttle laps on Mt 7. They remained comfortable throughout and gave me the option to go waist bag free with the three rear stow pockets. I’ll be getting ...

  11. Highdryss

    Absolutely love this product

    Used it while bikepacking, probably the most comfortable bib i had the chance to try.
  12. Bryan

    Fantastic multi use bibs

    Been wearing them mostly under MTB shorts for trail riding but they should be great paired with running tights when the temperature drops. My first pair of quality bibs and I can’t believe I waited so long.
  13. Daniel

    Super Bib Short

    This bib short is extremely light, yet comfortable also during long rides through the alps this summer. Also the chamois is not too thick. I am a big fan of Assos products but I must admit these bib shorts can match them.
  14. Craig

    Best on the market but could use some slight updates

    These are the most comfortable bib chamois I have ever found for MTBing. That being said, there is a seam on the mid back that is sewn on the inside rather than the outside which can be noticed at times. Also, the pockets on the back could use a zipper or a tighter opening so food and sundries ...

  15. Marc

    I've been waiting for this short for years!

    Finally a great lightweight bib with storage to wear under baggies on those hot days!
  16. streighty


    Great chamois, fit, material, and great for all day in the saddle.
  17. Ben

    10 out of 10 would buy again.

    Super nice bibs, very breathable due to the netting construction. Will buy a 2nd pair for sure!

  18. Nickm007

    Why did no one think of this!?

    Love the lightweight material, but superb padding. Riding gravel and mountain bike.
  19. Mike

    Best bibs ever

    I was not sure what to think when I got them. I’ve been on a 50 k and an 85k gravel ride and they are by far the best bibs I have road in. Will be definitely getting a second pair soon.
  20. Jordan Chaplin

    No brainer - Comfortable, light and good storage.

    Foundation Bibs are my go to year round. Usually paired with a glidepath or slab short, depending on my need for pockets. I have found the foundation bibs are super light and the chamois shape / material is spot on. Storage for snacks or lighter kit like a dry pair of gloves or a buff is the best ...

  21. slyfink

    Cool and comfy - but pockets don't hold a soft water bottle

    I bought these for use on hot days, hoping the back pockets would hold a 500ml soft water bottle. Though my bottles fit (I have a 500ml platypus and a 500ml Hydrapak stow), the material is too stretchy and doesn't hold the bottle in place, so it bounces out. It could be because the pockets are ...

  22. Stuart

    high quality feel

    I'm 6', 150 lbs. so, skinny. I choose the XS and it fits well. The chamois is very comfortable and the shorts breathe well. The pockets are little small but fit phone, bars and wind shell etc. The can be a little difficult to access but not a big deal. Overall this have a very nice feel to ...

  23. Dana

    First Bib Short

    I kept hearing fellow cyclists rave about bib shorts. I just didn't see any that appealed to me as I prefer to wear shorts in all my cycling missions. Then I found the Foundation Bib Short. They are perfect. Super comfy. Amazing venting. The rubber grip around the thigh is stellar. Padding is ...

  24. Mahykal

    Soo silky and comfortable

    I'm gonna be honest, at first I wasn't sure what to think about this fishnet line liner. My wife says they are super sexy.. :) My first ride didn't go well, I got chafed and I almost gave up on them. My problem was I used them on a hot summer day on a 5hr road/gravel ride with no ...

  25. The Only Juan

    Happy seat bones!

    It can't get more comfortable than this Bibs ! I've tried all major major brands best models and these are my favorite by far!
  26. Arnaud

    Comfort and breathability are amazing!

    I was looking for nice bib short with a chamois to wear under gravel shorts. As I simply love the comfort and overall performance of my RK1 summer bib short, I did not hesitate long and ordered the Foundation Bib Short. Wow, it did not disappoint! As for the RK1, the chamois concept works ...

  27. Conor

    Amazing summer bibs

    Super breathable, nice design touches with exterior only seams and nice chammy. Love having three small pockets at the back. Better than any other bib I've tried at this price point.
  28. Steve

    No need for a pack!

    Long single track rides in the mountains require a jacket, food, tools/tube, wallet and phone. The Foundation bibs, along with the pockets in my shorts allow me to leave my pack at home. Super breathable and comfortable. Thanks
  29. Owen

    Airy Comfort

    These bib shorts are extremely well ventilated, the mesh construction is well executed and provides the best moisture management in any mountain biking garment I have in my closet. I actually feel the difference when riding, other brands may make that claim but they don't come close to the ...

  30. Marc

    Awesome shorts

    The shorts are great. Very breathable and lots of room for tools and extra food. I only with the back pockets (or at least one of them) was a little deeper to better hold a second water bottle.
  31. Scott

    Comfortable / Breaths Well

    Excellent bib short. Breaths very well under shorts. Chamois is very comfortable.
  32. Mike

    Always the first pair out of the laundry!

    The mesh material keeps you noticeable cooler under your baggies and the chamois is extremely comfortable with it minimalistic design. The straps are made of the open mesh material as well, which really does keep give you an airy feeling. The front cut out does exactly what it is supposed to - keep ...

  33. Daniel

    The perfect match with a baggier short.

    The Foundation Bib Short are my favorite for warmer rides. Paired with a baggier short like the Slab or Farside they give a totally different experience compared to riding with a traditional bib short under your baggy short. So much cooler and more ventilated makes it much more comfortable on long ...

  34. Justin

    A blissful experience.

    These shorts are unlike any under-short I've owned. Ventilation is remarkable and the cut away in the front of the Chamois is a blissful feeling. They feel really light and truly disappear when you put them on.

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