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We truly believe we've created man's most comfortable underwear and we want you to experience it.

Give Crossfly a go and we guarantee you will find them more supportive and comfortable than your current ones.

So let's get started! Use the code trycrossfly20 at checkout. (Note: discount code only valid on full priced products)

20% DISCOUNT on first order
Money Back Guarantee


All our underwear feature our patent-pending X-Fly for quick access when nature calls and the internal support pouch, the Coccoon which eliminates skin on skin discomfort and chafing.


Pro 7" Boxersare best for those who require more breathable, sweat-wicking underwear.

IKON / IKON X come in shorter lengths (3 and 6 inch) and are made from super soft modal fabric

Just ran 61km ultra this weekend and never had to readjust or felt uncomfortable...

Dicky (from YouTube Review)

Crossfly has been a vision of a small team of sporting product professionals from the UK and America. Together, we have acquired decades of experience working in the Sports industry for global brands within Marketing and Product Innovation. After a few false starts, some legal issues, a eureka moment, and a global Pandemic Crossfly was finally ready to get going.

WE'VE RAISED THE BAR and deliver the most comfortable underwear and socks you will ever wear; packed with patent pending technologies and features that offer ultimate comfort whatever you're doing. GAME. CHANGED.