BIOFIT ORIGINS
Zero-Irritation Construction
Modal-Enhanced Softness
Redesigned All-Day Fit
Next-Level Breathability
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 (CM)
(Normal leg, everyday fit)
| Size | Waist (CM) | Leg Opening (CM) | Length (Side Trouser Length CM) |
|---|---|---|---|
| S | 68–76 | 18.5 | 22 |
| M | 76–82 | 19.5 | 23 |
| L | 82–88 | 20.5 | 24 |
| XL | 88–94 | 22 | 25.5 |
| 2XL | 94–100 | 23 | 26.5 |
| 3XL | 100–106 | 24.5 | 27.5 |
| 4XL | 106–112 | 25.5 | 28.5 |
| 5XL | 112–118 | 26.5 | 29.5 |
BioFit Size Guide – Original (Inches)
(Normal leg, everyday fit)
| Size | Waist (Inches) | Leg Opening (Inches) | Length (Inches) |
|---|---|---|---|
| S | 26.8–29.9 | 7.3 | 8.7 |
| M | 29.9–32.3 | 7.7 | 9.1 |
| L | 32.3–34.6 | 8.1 | 9.4 |
| XL | 34.6–37.0 | 8.7 | 10.0 |
| 2XL | 37.0–39.4 | 9.1 | 10.4 |
| 3XL | 39.4–41.7 | 9.6 | 10.8 |
| 4XL | 41.7–44.1 | 10.0 | 11.2 |
| 5XL | 44.1–46.5 | 10.4 | 11.6 |
BioFit Size Guide – 2.0 (CM)
(Longer leg, more coverage)
| Size | Waist (CM) | Leg Opening (CM) | Length (CM) |
|---|---|---|---|
| S | 68–76 | 19.5 | 32 |
| M | 76–82 | 21 | 33 |
| L | 82–88 | 22 | 34.5 |
| XL | 88–94 | 23 | 35 |
| 2XL | 94–100 | 24 | 36 |
| 3XL | 100–106 | 24.5 | 37 |
| 4XL | 106–112 | 25.5 | 39 |
| 5XL | 112–118 | 26.5 | 40 |
BioFit Size Guide – 2.0 (Inches)
(Longer leg, more coverage)
| Size | Waist (Inches) | Leg Opening (Inches) | Length (Inches) |
|---|---|---|---|
| S | 26.8–29.9 | 7.7 | 12.6 |
| M | 29.9–32.3 | 8.3 | 13.0 |
| L | 32.3–34.6 | 8.7 | 13.6 |
| XL | 34.6–37.0 | 9.1 | 13.8 |
| 2XL | 37.0–39.4 | 9.4 | 14.2 |
| 3XL | 39.4–41.7 | 9.6 | 14.6 |
| 4XL | 41.7–44.1 | 10.0 | 15.4 |
| 5XL | 44.1–46.5 | 10.4 | 15.7 |
BioFit Size Guide – BIOFIT ORIGINS
(More leverage, more presence)
| Size | Waist (CM) | Waist (Inches) | Leg Opening (CM) | Length |
|---|---|---|---|---|
| 2XS | 56–60 | 22–24 | 19 | 26 cm |
| XS | 61–66 | 24–26 | 20 | 26 cm |
| S | 70–76 | 28–30 | 21 | 26 cm |
| M | 76–81 | 30–32 | 22 | 27.5 cm |
| L | 83–88 | 33–35 | 23 | 29 cm |
| XL | 91–101 | 36–40 | 24 | 30.5 cm |
| 2XL | 106–112 | 42–44 | 25 | 32 cm |
| 3XL | 112–118 | 44–46 | 25 | 32 cm |
BIOFIT ORIGINS
Feel The Difference Instantly
+500.000
BIOFIT boxers are being worn right now
Why These Will Change Your Life
It sounds ridiculous to say underwear can change your life.
But it’s the first decision you make every morning.
Men only notice how much they were putting up with once they stop.
Small standards compound.
This is one of them.
Built for Everyday Life
Origins isn’t about performance or showing off.
It’s about feeling comfortable through meetings, drives, and long days.
You don’t have to think about them.
They don’t get in the way.
They just do their job.
Built on What Men Already Love
Origins wasn’t designed just to look good.
Origins was refined from BioFit’s original bamboo underwear that men already wore and trusted every day.
Origins keeps the softness and breathability men liked, while adding a smoother bamboo + modal blend, a more stable fit, and targeted fabric placement where comfort matters most.
It’s a familiar feel, done better.
365 days quality guarantee
We guarantee the best quality at the lowest price. And because we're so confident in our products, we offer a one-year quality guarantee.
Shipped within 24 hours
We understand that you're excited to receive your order and we try our best to make sure you receive it as fast as possible.
Don't want to wait? Select priority shipping to get your order even faster!
100.000+ Happy customers
Join the thousands of men that have elevated their comfort with BIOFIT®.
24/7 customer support
Our number one priority is your satisfaction, that's why our customer support team is available 24/7 to assist you with any questions you might have
FAQs
What makes BioFit Origins different from regular underwear?
Most underwear loses comfort as the day goes on. Origins is designed to stay comfortable over long wear, reducing heat, shifting, and irritation.
Is BioFit Origins suitable for sensitive skin?
Yes. Many men choose Origins because it feels smoother and causes less irritation, especially during extended wear.
Will I notice the comfort right away?
Yes — most men do.
Around 90% of customers say they noticed the difference on the first wear, often within the first few hours. That’s the most common feedback we receive.
What if I don’t like the boxers?
Honestly? It’s unlikely.
But if Origins isn’t for you, that’s fine — you’re covered.
We offer a 30-day money-back guarantee, no questions asked.
And on top of that, every pair is backed by a 365-day quality guarantee.
Try them properly. If they’re not right, you won’t be stuck with them.
What does the 365-day guarantee cover?
If there’s ever an issue with quality or durability within a year, we’ll make it right.
Simple as that.
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