New bundle packs - receive Free socks & free shippingShop
Summer sale - 10% offShop
Ambassador Pack: underwear for just £15Show deal
Performance Series

Crossfly Men's Boxers - PRO 7"

Fit tips

True to size

Size: S 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
Color: Black/Royal Blue
Black/Royal Blue
  • First Pair Money Back Guarantee


Crossfly Pro 7 Inch Boxer is built to work with your every movement and crafted with 3D breathable, fast drying panels that ensures maximum comfort. The Pro 7 also features our patent pending technologies; the Coccoon and X-Fly. This is your ultimate workout partner.


  • Fabric: 85% polyester / 15% spandex
  • Breathable fabric & articulated mesh fly & seat panel

The Pro 7" Boxers are not only packed with features to enhance support and comfort; they are also ultra breathable and sweat wicking. Take a look at our reviews to see why these boxers are the ultimate workout partner.


    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.

  • Stay Fresh

    Anti-microbial and eliminates unwanted smells.

  • Breathable

    Breathable mesh panels get rid of moisture and dries fast for maximum comfort.

  • Planet Friendly

    Buy Nice, Not Twice.

This style is true to fit.

An athletic fit with a 7-inch inseam so they sit higher on your hips a little higher to offer more support. And of course, the ZeroFold Waistband ensures it stays in place.
The sportier type who is looking for more support and compression when working out. The Pro 7" Boxer is designed for a wide range of more active sports from football to HIIT.

Customer Reviews

Based on 25 reviews
martin stannard
Excellent product

Excellent product...very comfortable...unfortunately the price, notwithstanding the quality of the product may prevent purchase. Inaddition the socks are very and try is my advice.

Richard Stanton

Very comfortable & light. Great support


good stretchy material but stiff
slightly thicker fabric,too warm,not too breathable
crotch pouch restrictive,convenient fly access
best for cooler months

Hi Hung Liu,
Many thanks for your review. We're a little surprised to hear of the 'stiff' description of the fabric and that you found this to be thick. We have added strategically light, airy, mesh panels on the back-side and underside of the Pro 7' to ensure a light airy feel and breathability. You also describe the Pouch as restrictive; can I check that you have ordered the right size? It could be the reason for your average experience. Many thanks and Kind regards, Val & the Crossfly team

David Waldrep
Pro 7 boxer brief

Material felt great and comfortable. I’m 5’9” and 180 lbs and ordered a medium and the fit was good. Only problems were the waistband rolls and they felt high-waisted, like When I pulled them up, they came up too high above my waistline. Overall a good boxer brief and work well for working out in them.

Steve the Cornwall Dog
Great value and quality

I've been struggling to find comfortable yet supportive 'undershorts' to wear in the gym.

These strike just the right balance between supportive and comfortable, indeed they feel so comfortable when on I never feel the need to adjust either the waistband or the 'legs' during a gym session. They are a lovely soft material to the touch, and the 'double layer quick release' pouch is super comfortable and very handy when I've taken on board too much water during a workout. Probably the most comfortable undershorts I've owned, highly recommended.

Jesper A.

Good length, comfortable material and finally a pair that stays in place during my runs. Well recommended 👍

Money back guarantee

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

"Arrived on Saturday and I can honestly say that they are worth every penny"

- Vince Harris

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.