Finally, comfortable active underwear for athletes. Biker Flex is our classic 9 inseam boxer brief in a lightweight, sweat-wicking, and supportive recycled poly fabric.

Active underwear made for movement
9″ inseam, our longest length
Medium thigh compression
Sweat-wicking and quick-drying active knit fabric
Sleek and smooth for friction-free fit under clothing
Organic cotton gusset for breathability and hygiene