Toggle Nav
My Cart

Foundation Bike Boxer Brief

100 % of 100
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.


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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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 ...

  7. 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 ...

  8. 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 ...


Scroll to see more