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Foundation Bike Boxer Brief

99 % of 100
Coming Soon
New Colours
A slim, padded bike boxer brief, designed to elevate your ride. Pull it on under your favourite trail short for quick comfort wherever the day takes you.
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

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

Product Reviews

  1. 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.
  2. Tobi

    Perfect for commute and work

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

  3. Scott

    For Commute

    Excellent light weight for commuting to work.
  4. 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 ...

  5. 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 ...

  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. 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 ...

  14. 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 ...

  15. 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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