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Size Chart
Because of Undyz specific and proprietary design, the High Thigh measurement is an extremely important factor. The full circumference of the leg at its highest point, underneath the buttocks and all the way up to that spot that likely gets the most uncomfortable. Standing as straight as possible and measuring while level will provide the most accurate fit.
STOP! We size differently
Important: Undyz is engineered differently.
Our underwear is designed to give you a perfectly tailored fit. The wrong size will certainly feel uncomfortable. Use a tape measure to measure two points. Waistband, and upper thigh.
Men's jean sizes can be anywhere from 2-5 inches off from accuracy. Measure once (60 seconds). Perfect fit for life.
The real reason your underwear has never felt right
Most underwear fails where it matters most:
the inner thigh crease—the birthplace of sticking, chafing, sweat pockets, and mid-day adjustments.
Traditional designs focus on fabric… not actual male anatomy in motion.
That’s why comfort collapses long before your day ends.
Let customers speak for us
Most comfortable pair I’ve owned. As short bigger guy no underwear ever worked for me. On any given day I can drive 6-8 hours and this hold up very well. I’m no longer having to pull over to fix myself. I sweat less and don’t have to adjust myself all day. The kicker for me was walking 12 plus hours at a theme park and nothing, no chafing, no rubbing, minimal sweat and they don’t get lose throughout the day like other brands!
So right out of the gate once you open these you can tell the quality just by the packaging. But the real test for me was putting them on right after a shower. I’ll tell you what, the feeling of Shrek and Donkey fighting over territory in the swamp was nonexistent. I’m about to replace all other pairs for Undyz. I’ve even tried the super expensive Mariano wool and Undyz makes them look like a garbage bag in comparison. Customer for life
Really love my undyz!!! Great for playing sports or just sitting all day.. great for not sweating and stinking and super comfortable
I do a lot of hiking and hunting in extreme weather from 90f down to 10f. I have gone over 15 miles in one day. No adjustments, no chaffing. This is the only underwear I wear for any situation. 10/10. Buy them!
Best underwear I've ever worn. When you first put them on you will kind-of understand. But after a few hours you will 100% understand why everyones loves them. Already have recommended to my dad and friends
Wore a pair to a volleyball game and it was a game changer for sure!!! Had no chafing or folding in weird places.
These are the only thing my husband asked for for Christmas. He loves his Undyz and he says they’re the first pair of underwear that hasn’t made him chafe!
Saxx. ExOfficio. Cariloha. I've tried them all, and Undyz left them in the dust. The fit and fabric are simply leagues better than anything else on the market, and the interior walls are a revolutionary improvement on the pouches that other brands offer. I cannot recommend these boxers or this company enough!
Frequently Asked Questions
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Undyz has a few things that set us apart from anyone and everyone else.
1) Are gap between sizes is smaller than anyone. That's why you might be a XL in traditional underwear but find yourself in a 2XL or even 3XL in ours. We base our sizes on true measurements so that you get
a tailored fit.
2) Our patented InnerWall System has premium fabric walls that separate the inner legs and the family jewels. These walls stay put which means that there is never an opportunity for skin-on-skin contact which is a source of a lot of men's underwear issues.
3) We only use the highest quality fabrics, threads, and stitching techniques to ensure durability, comfort, and consistency. Our 95% Modal / 5% Spandex blend guarantees you that no toxic chemicals or plastics will go anywhere near your groin.
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Modal is a fiber made from Beech trees. The fabric is extremely smooth and soft. It's unbelievably breathable and durable. The important thing to note about Modal is that it is better than cotton in almost every way.
here's a video about the company we use
Learn about how of fabric is made without any exposure to toxic chemicals here.
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Choosing the right size is going to be the most time-consuming part of your initial purchase. We do no use jean sizing to select your Undyz size. Since or margin between sizes is much smaller than other brands, we've opted to use real, true, and accurate measurements of the body to ensure you get a perfectly tailored fit. Measure once, feel the difference.
Measuring your waist and your upper thigh (between the valuables and the inner leg), is all you need to make sure everything fits and moves perfectly with you.
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We are currently working on a "Try before you buy" feature. We're confident that this will be a positive feature for a few reasons:
We currently have zero returns to date. We have had just a few sizing exchanges. Undyz is, unfortunately, something you really have to wear before it all clicks.
Men from around the world, yes, the world, have said that it really has changed the game. We have spent over 10 years developing a product that you'll love.
If you want to be notified the moment that we unlock the "Try before you buy" feature, click subscribe at the bottom of the page and comment "Try before you buy" on any of our social media videos and you will be placed on that list.
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Undyz will hold up is some pretty harsh "college laundry" conditions.
However, your Undyz will last the longest and stay soft and comfy longer when you follow our care instructions:
Wash in luke warm or cold water. do not use bleech, and wash separately from heavily soiled clothes. Tuble dry on low - medium low. High heat will cause the waistband to fail long before the fabric breaks down. You can also hang dry your undergarment, but who has patience for that?
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We want to make sure that you love your Undyz. We want to make sure that you are sized perfectly.
That being said, we ask that you measure before you buy. If your Undyz arrive and they are not perfect, we will ask a few questions and process an exchange for the cost of shipping.
If you don't like your Undyz and you don't plan on buying them again, we will issue a full refund.
We may ask a few questions about your experience and about the garment itself.
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Shipping is based on several factor ranging from your location to which shipping method you choose at checkout. Orders are typically fulfilled and shipped in under 24 hrs. Orders placed before 9am are shipped same day.
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Undyz was designed for athletic activity. Some of our customers are marathon runners, hunters, avid hikers, mountain climbers, basketball, volleyball, and soccer players. The list goes on.
Whether you drive for Uber, wear suits to work every day, or run ultra-marathons, Undyz is perfect for you.
Trusted by athletes • veterans • fathers | 5★ comfort | Patent-backed design
Introducing the InnerWall System™
Dual-wall section that eliminates friction before it starts
- Prevents anatomy from collapsing into the thighs
- Ends sticking at chafing at the root
- Improves airflow and reduces heat buildup
- Supports natural movement without squeezing
- Stays in place all day-no ride-up, no adjusting
- Premium fabric that promotes skin health
- Quality stitching to eliminate irritation
Immediate Benefits You’ll Feel on Day One
No more peeling yourself off your leg
Even on long walks or hot days
No more public micro-fixes
Breathable modal blend
Stays put, never rides up
High-Thigh + Waist sizing accuracy
Underwear So Comfortable, You’ll Forget You’re Wearing It.
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Curved seams for enhanced comfort
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Extra room in the seat for better fit
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Moisture-wicking, breathable Modal fabric
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No-roll waistband & chafe-free stitching
The Undyz Starter Pack
Please read!
Important: Undyz is engineered differently.
Our underwear is designed to give you a perfectly tailored fit.
Men's jean sizes are anywhere between 2-4 inches off from accuracy. Measure once (60 seconds). Perfect fit for life.
Undyz Sizing Chart
| Waist Inches (not jean size) | <32 | 32–35 | 35–37 | 37–41 | >42 | |
|---|---|---|---|---|---|---|
| Thigh Circumference | Waist Size | S | M | L | XL | 2XL |
| Slim | 18 | 20 | 22 | 24 | 26 | |
| (Regular) | 20 | 22 | 24 | 26 | 28 | |
| Plus | 22 | 24 | 26 | 28 | 30 |
The Undyz Collection
Built Out of Necessity — Not Tradition
After years in the Marine Corps and long days building businesses, Alyxander was tired of underwear that stuck, chafed, rolled, squeezed, and forced constant adjusting.
Premium brands weren’t solving the real problem.
So he engineered a new internal architecture, tested prototypes obsessively, secured multiple utility patents, and built the underwear men actually needed.
