Underwear packed with smart patent-pending technology

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Socks packed with smart patent-pending technology

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Based on 198 reviews
Comfy socks

They are comfortable to wear and size wise ok for my feet


Doesn’t offer any sort of support - waste of time.

Great for Golf and Tennis

A really great performance sock, with good compression and some really functional features.

They are good

Finally found some underwear that keeps my private bits in place

So Comfy

Nice socks would recommend.

Great pants

One the best underwear I bought in a long time. Will buy more.

New underwear

A comfortable fit, nice soft material.
Beware sizing XL is borderline for me.
If in doubt ask their helpline.

Sock review

First time very comfortable

Great trunks

I ordered and really liked the socks so thought I’d try 1x pair of trunks as they are not cheap. Soon as I wore them I went and bought another 5 x pairs, the 20% discount didn’t work online so I emailed them and Val sent me out another pair straight away so all in all I am very happy with what is the comfiest trunks I have ever worn.

Great product and service, a must for all.

Product is really good and service faultless. What more could you want. Thanks.

Top underwear

Been the best I’ve worn to date it’s all I wear now
Thanks Mr flash

Great product terrible web site

Despite several attempts I was unable to buy online. Eventually emailed customer service and got exactly what I wanted. Great products but really need to sort out website links

HI David, many thanks for your review and purchase. We appreciate your feedback and we continue to improve our site for better navigation. Kind regards, Val



Dreadfull website links

The pants are great. I would like to buy more but every time I try I have difficulty navigating the web site

Hi David, thank you for your review and feedback. We are constantly improving our website to help navigation. If ever you need help finding your products should you encounter any issues in future, please don't hesitate to get in touch at Best regards. Crossfly

IKON 3" Trunk
Steven Jones
Comfort and Quality

Very comfortable, good looking and brilliant design.


Lovely quality socks, prompt delivery. Happy customer!

Comfort and beyond

They are the most comfortable underwear that I have worn


Does what it claims

Comfy and stays in place

Nice comfy socks.

Excellent trunks for gym and the days activity, everything remaining snug and comfortable.

Comfy Socks

Have now worn these couple of times and have to give them a 5 star for comfort.

Great material

Took over 14 days to arrive. Nicely packaged but the short trunk sizes are too large. The owner did tell me they come oversized but I didn’t believe him so ordered my exact size but should have listened! Lovely soft material but unfortunately too big! First time I’ve ever bought a pair of pants too big in my life. As I had to wait for delivery they threw in an extra pair smaller but still too big and unfortunately doesn’t support what I wanted them for. Time will tell and after a few washes may shrink a bit? I would suggest in my case going two sizes smaller for extra support. Sorry but won’t be re ordering but for slim Jim’s out there I’m sure you will love them. They feel really nice and much more comfortable than CK’s with a much better waist band. Well done Crossfly

Underpants that makes you feel smooth

The most comfortable underwear that I have ever been lucky enough to wear no matter what your age I would recommend you try a pair and will guarantee you will buy some more

Good investment

Used them for both runs and long walks with the pram. No chafing from these boxers compared to other ones in my drawer. Stretchy fabric so S suited me perfect, usually a M. Nice packaging was just a bonus 👍

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.