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Everyday Series

IKON X Men's 3" Trunks - Navy/White

Fit tips

Can fit one size too big. If on the cusp of a size, please opt for a size down. Read more in the "How it fits" section below.

Color: Navy/White
Size: M What's your size?
Size Guide

Men's Underwear

underwear size guide

The measurements on the size chart are body measurements. Find your correct size in the chart below.

Note that each style may fit differently due to the fabric used.

Size Chart








Waist (Inch)







Waist (cm)








Fit Tips

IKON & IKON X styles: (Choose one size smaller)

This style is made from Modal fabric which is quite stretchy. As such, we recommend that you order one size smaller than your usual size for a better fit.

PRO 7" style: (True to size)

Our customers find this style fits true to size.


How to measure

  • WAIST: Measure around the narrowest part (typically where your body bends side to side), keeping the tape horizontal.
  • INSEAM: Measure the from where your crotch meets the top of your inner leg.
Crossfly-how to measure
  • First Pair Money Back Guarantee


Our game-changing Everyday Series is the ultimate premium underwear, combining two patent-pending technologies. The innovative X-Fly provides fast and easy access, and our Coccoon internal pocket support system minimizes chafing and provides optimal comfort and support. Teamed with our super-soft Modal fabric, we are confident Crossfly will soon become your everyday go-to favourites.


  • 95% modal / 5% elastane
  • Super soft fabric for next-to-skin comfort that dries fast and remains breathable

Arguably the best & most technical pair of underwear man has ever seen, the IKON X 3" is loved by our customers for being the most comfortable pair they've ever worn with features that make sense and work.


    Eliminates skin on skin friction and chafing providing greater comfort and support.

  • X-FLY

    Easier, faster access when nature calls.

  • ZEROFOLD 360

    Stays in place however active you are. 4-way stretch construction works with your every movement.

  • DRI-PX2

    ‘No Show’ Dual layer protects against excess drips and moisture.

This boxer is made from Modal fabric which is naturally quite stretchy. As such, we recommend that you order one size smaller than your usual size for a better fit.

Fit one size too big.

Choose S if normally M (31,32")
Choose M if normally L (34, 35")
Choose L if normally XL (38, 39")

This 3-inch inseam style is a low-rise which means they’ll sit lower on your hips for a trendy look.

Model waist size is 32" and wears size Small
The guy who goes between the gym and the boardroom. This versatile pair is designed for a wide range of sports from running to hiking as well as more relaxed activities.

Money back guarantee

Love them, or we'll refund or exchange your first order.

Customer Reviews

Based on 277 reviews
Good, but room for improvement

Overall, they are comfortable and the modal fabric is lovely and soft. There are a lot of pouch undies on the market, and it's difficult know which are best. At the end of the day, we all have different anatomy. I do feel though that the 'coccoon' could be a little bigger in order to better hold things in place. So if Crossfly are reading this, please could you consider a line with wider strips of fabric for the coccoon for better support please.

Cathal Deery

While the trunks feel so light and soft on my skin, they need to have more support in the pouch area. They don't hold my testicles in place as well as I had hoped.

Lisa-Jane Cross

They were bought for my son who is of little words when it comes to his underwear. He hasn't complained so something must be right. I'm just happy he received them as he lives in the middle of nowhere in Scotland. Thanks postie.

Donald Belfus
3" trunks

I purchased the size according to the size chart, wish I had ordered a size smaller. Feels like too much material. They are nice though.

Paul Giglio
Bad design

Nothing stays where they’re supposed to.

Ceir Coral
Outstanding fit and comfort!

Very pleased with Crossfly! I’m a fan. Definitely go one size down if you’re between sizes.

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.