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Men's Foundation Bike Boxer Brief

99 % of 100
A slim, padded bike boxer brief, designed to cushion under casual clothes or baggies for quick comfort wherever the day takes you.

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.


Made with a free-feeling low profile chamois, Foundation keeps you comfy and cool, with a a breezy front cut-away that keeps everything dry under intense efforts in hot conditions. With ‘just right’ cushioning, the Foundation Brief excels on short rides, gravel grinds, park days and anything that ends with an extended après. A minimalist waistband keeps the brief in place, but doesn’t dig in when you’re digging deep.



  • Body: 62% nylon, 18% polyester, 20% elastane
  • Lining: 100% polyester


  • Inseam: 4¾ in / 12cm
  • Ergonomic padded boxer brief
  • Front cut out for breathability
  • Lightweight protection
  • Elastic waistband

Product Reviews

  1. Graham

    A must have

    Lightweight with just the right amount of padding where you need it, none where you don't. Buying another pair now.
  2. René

    Perfect for rides in everyday clothes

    Very comfortable to wear with high cycling comfort, thin padding, almost feels like you're not wearing a bib, great for daily commute to work or generally driving in everyday clothes, easy to wear all day in the office too. My favorite piece for daily commuting.

  3. Murman

    Foundation Boxer Brief

    I picked these up for mountain biking and shorter easy going rides for a little extra comfort. I have other shorts like these from other companies but the Foundation Boxer Briefs are by far a much better option. They fit much better! Like a proper bike chamois short but more comfortable for MTB, and ...

  4. Rob

    Very comfy, barely noticeable underwear

    Like your favorite boxer shorts but with a really well design and shaped pad. You barely notice your wearing them. Very comfortable and discreet
  5. Alan

    Perfect for winter fat biking

    These are perfect for winter fat biking when you want a bit more comfort for longer rides, but still need to wear leggings or long johns to keep warm. Look forward to trying them under MTB shorts for summer rides.
  6. Gi

    Good fit

    I wore it when I rode a bicycle for about two hours, and it was comfortable and nice. I want to buy more.
  7. AW

    Great for the commute

    I've been wearing a couple of pairs on rotation for the last few months for the commute to work (40 minutes each way). They are very comfortable under a pair of mtb shorts on these types of ride where you don't want or need to wear full lycra. I haven't tested them on longer rides ...

  8. Jake

    Just the right support

    I was very skeptical of these out of the bag, but pleasantly surprised after the first several rides. The pad is slim and lacks the typical frontal zone but provides more than adequate comfort for 3 hour rides so far. This wouldn’t be my first choice for riding bent low on the XC bike but are ...

  9. DaveC

    All You Need, Nothing You Don't

    I got a pair of the Foundation Boxers when they first came out as an alternative to bulkier options for shorter rides. Over time I used them for all rides including a 34 mile epic in Steamboat Springs, all-day rides on the CO Trail, etc. Combined with the Slab short you're as close to riding ...

  10. Em

    Foundation boxer

    I only started commuting (about 20 km per day) and decided to try these chamois boxers instead of committing to a bib. So far, they've been really great! Even though I change out of them to avoid wearing them out, they could easily be worn comfortably throughout the day. I bought one in the ...

  11. Alain

    Finally a design that makes sense!

    I was initially very curious to see and feel what seemed to be a very different design. Now I am happy to say that this is not just a revamped packaging of the game old chamois. This is the most breathable, confortable and male apparatus friendly design ever. Thank you 7mesh!!
  12. DMB

    Amazing, comfy and just right for shorter rides/commuting!

    I was looking for something with less padding than bibs for shorter rides with the kids and commuting when a stumbled across these boxers. The material is soft, comfortable and just enough padding to take the edge off. Off the bike the padding is hardly noticeable and they feel just like undies. ...

  13. Matic

    Best "undershorts"

    Lightweight, snug fit, leg grippers holding in place, the front split of the chamois well-thought-out, reasonably breathable. I wear under the Farside shorts for summer riding as well as for commutes. Adds another quality level to undershorts. Ordered one more piece.
  14. Tobi

    Perfect for commute and work

    Nice to wear it under my normal shorts when I'm commuting to work. (12k)

  15. Scott

    For Commute

    Excellent light weight for commuting to work.
  16. Gordon

    Finally a slim boxer brief I can actually ride in!

    I've tried many other slim padded boxer brief riding shorts, but virtually all of them either rode up my thighs after a few minutes of riding or had too big of a pad. 7mesh's boxer brief's shine where others don't - the elastic on the legs stays down, the shape of the pad is ...

  17. James

    Another awesome bit of kit from 7mesh

    7mesh do it again with another excellent product. After already purchasing the Revo and Slab shorts, I wanted a minimalist padded short liner (rather than the usual 'nappies'). This brief is awesome. The padding is in just the right place and you hardly notice you're wearing it. Fits ...

  18. Bo6

    Good fit

    Fits nice and snug, good chafe protection. pad just covers my "sit bones" wouldn't have minded a cm wider. I use them for short rides and shopping under normal shorts and pants plan to use them for some long gravel rides.
  19. Justin H

    Perfect for quick laps.

    I love these for the ease of use when it comes to the quick after work lap or a quick tide to the lake. Easy to slip them on, no bibs or hassle and super comfortable! A thousand times better than riding with no padding.
  20. Roberto

    Great new piece of equipment

    Thanks to 7mesh std foundations shorts, I already was appreciating lightweight padded shorts...these are a new world. Perfect for summer rides.
  21. Robinson

    Super comfortable

    The 7mesh bike boxer briefs are very comfortable to wear on and off the bike. Very lightweight, yet do the job for most riding applications. An option with more padding on the tailbone and hips would be an excellent option for other MTB purposes.
  22. SG

    Like these better than bibs

    Long-time road cyclist turned sometimes gravel and primarily mountain biker. Super comfortable, low profile and just easier than bibs. In a matter of weeks I have multiple pairs and they are now my go to for any shorts without built in chamois.
  23. Mike (Ride Ottawa)

    Amazing comfort

    I’m a fan of thin chammies and these are the bomb. I wear them for mtb under my baggies for 30 minutes of quick skills practice, and for 4 hour trail rides. The split front is amazing to keep keep the boy parts dry. Bought one pair, tested, ordered 2 more. Highly recommended.
  24. Michael

    Great Everyday Shorts

    Great Shorts, wear them at once after receiving for a 3h ride and didn‘t notice them. That‘s for me the best feature of a chamois. Came back home and forget to change my clothes, because they are so comfortable.
  25. Gordon


    I was excited to pick up a pair of the Foundation bike briefs. I do a lot of clinics, skills coaching, and apres activities that have me wearing my Foundation FUNdies more and more. Great fit, lightweight material and chamois that give just enough moisture absorption and cushion without adding much ...

  26. Garrett

    Perfect for my MTB'ing needs

    I ride a lot of road, so I'm well adjusted to long days in the saddle. When I started mountain biking a few months back, I was wearing bibs under my baggies for the chamois. I quickly learned that with all of the sitting, standing, hopping, etc. the thick road chamois was too much and the bibs ...

  27. David W

    Great when your up to more than saddle time.

    I put these through a grueling test combining a 45 minute trainer ride followed by 45 minute apres-ride couch training session. They fit great under shorts, stayed in place, ventilated well and took the edge of the saddle time and unlike my fully padded MK3 cycling shorts were only marginally ...


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