BIOFIT® Essentials Boxer Trunks 5-Pack Green | + 5 FREE
So soft you forget you're wearing them
92% bamboo, cool and dry all day
365 days quality-guarantee
Ladies & Gentlemen, we've crafted the ultimate size guide for your new favorite boxers, thanks to your feedback.
Don’t be surprised if you find yourself thinking, “Wow, I’ve never gone this big before!” Yep, our sizes tend to be more snug, but trust the guide—it’s your best bet for a great fit.
Still unsure? Reach out to us! No question is too small when it comes to perfect fit!
BioFit Size Guide – Original
(Normal leg, everyday fit)
BioFit Size Guide – 2.0
(Longer leg, more coverage)
BioFit Size Guide – BIOFIT ORIGINS
(More leverage, more presence)
BIOFIT® Essentials Boxer Trunks 5-Pack Green | + 5 FREE
What they're made of
92% bamboo, 8% spandex.
Bamboo is naturally softer than cotton:
no sharp fibres, no irritation, no uncomfortable rubbing.
It breathes in a way cotton simply can't, keeping you cool and dry whether you're at a desk, at the gym, or working outdoors.
They also hold up. Men are still wearing their first pairs twelve months later. Wash after wash, they keep their shape and their softness.
Wash at 30°C for best results.
Getting the right fit
Our sizes run smaller than standard sizing. We hear this a lot, so trust the size guide above before you order. Most men need to go up one or two sizes from what they'd usually pick.
Still unsure? Drop us a message. We'd rather take two minutes to help you get it right than have you order the wrong size.
Delivery & guarantee
Dispatched within 48 hours. Delivered in 7–10 days, worldwide.
Not satisfied? Return within 30 days for a full refund, no questions asked. We're confident you won't need it.
Effortless Comfort
No adjusting. No bunching. Just get on with your day.
Naturally Breathable
Bamboo breathes. Cotton doesn't. Cool and dry from morning to night.
These Last Long
Wash after wash. Still like new a year later.
Effortless Comfort
No adjusting. No bunching. Just get on with your day.
Naturally Breathable
Bamboo breathes. Cotton doesn't. Cool and dry from morning to night.
These Last Long
Wash after wash. Still like new a year later.
Over 2 million pairs sold.
Once you try them, everything else feels wrong.
For the man who's been putting up with less.
You shouldn't have to think about what you're wearing.
Most men have spent years adjusting, readjusting, dealing with it. The waistband rolling, the fabric riding up, the constant discomfort that you've just... accepted.
Biofit's bamboo fabric sits differently. Soft enough that you genuinely forget you're wearing them. No adjusting. No bunching. Just get on with your day, from the first hour to the last.
Cool and dry. All day. Whatever you're doing.
Cotton holds heat. Bamboo doesn't.
The difference becomes obvious by lunchtime on a warm day, or after half an hour at the gym, or on a long shift outdoors.
92% bamboo means the fabric breathes naturally, moisture moves away from the skin, temperature stays regulated, freshness lasts. No sticking. No discomfort building through the day.
One problem with boxers this good.
Men buying Biofit are still wearing their first pairs a year later, same softness, same fit, same shape after dozens of washes. No falling apart after a few months.
The 5+5 deal gives you 10 pairs in one go at £3.90 each. Enough to sort your drawer out properly and never think about it again.
Just make sure you order enough. Partners have a habit of claiming a pair or two for themselves. Which, fair warning, happens more than you'd think.
365 days. If it's not right, we'll fix it.
If your boxers develop a quality issue within the first year, a hole, a seam, anything that shouldn't happen, we'll replace them. No awkward back and forth. Just send us a photo and we'll sort it.
200,000 men who stopped settling.
Over 2 million pairs sold worldwide. Try them and you'll understand why they never went back.
A real person. Any time.
No question is too small. Whether you're unsure about sizing, wondering where your order is, or just need a hand, we're here. Drop us a message and we'll get back to you, as fast as we can.
Your order. At your door. No fuss.
Dispatched within 48 hours. Delivered in 7-10 days worldwide. Free shipping on every order, no minimum spend.
FAQs
How comfortable are they, really?
Comfortable enough that men bin every other pair they own within a week of trying them. The bamboo fabric has no sharp fibres, it's naturally smooth against the skin, and soft in a way cotton never quite manages. The most common thing we hear is that you forget you're wearing them. That's the point.
What's the difference between Bamboo and Cotton?
Cotton holds heat and moisture against the skin. Bamboo pulls moisture away and lets air through. On a normal day you might not notice. On a warm day, after a workout, or after a long shift, you'll notice. Bamboo also holds its softness through washing in a way cotton doesn't, which is why durability is so much better.
How do I get the sizing right?
Our boxers run smaller than standard sizes, most men need to go one or two sizes up from their usual. Check the size guide above before ordering. If you're between sizes or unsure, go up. And if you're still not sure, message us. We'll help you get it right.
What's the 365-day quality guarantee?
If anything goes wrong with the product in the first year, quality issues, fabric problems, anything that shouldn't happen, we'll replace it or refund it. No hoops to jump through.
My wife/partner keeps wearing mine. Is this normal?
More common than you'd think. The bamboo is soft enough that it tends to cross boundaries. Our advice: order enough pairs that you can afford to lose a few.
- Choosing a selection results in a full page refresh.
- Opens in a new window.