Use size chart below for slightly relaxed fit.
For snug fit, size down.

Size Chart

PageContent

PATENT-PENDING DURAFLOW™ TECHNOLOGY

THE LAST TEE
YOU'LL EVER BUY

Made from hemp, bamboo & organic cotton. Zero polyester. Zero PFAS. Zero microplastics.
Built to last a lifetime - and backed by one.

★★★★★ Trusted by 350,000 Men
TRY IT RISK FREE
Lifetime Warranty
Buy 3 = Free Shipping

"I now own 12 of these. Nothing else comes close."

· Marcus T., Verified Buyer · Construction Foreman, TX
★★★★★
3,640+
5-star reviews
4.9
avg. rating
0%
polyester
lifetime warranty
0
microplastics shed
3,640+
5-star reviews
4.9
avg. rating
0%
polyester
lifetime warranty
0
microplastics shed
THE PROBLEM NO ONE TALKS ABOUT

THE TEE YOU
WEAR EVERY DAY?

IT'S MADE

OF PLASTIC

And it's doing more damage than you think.

Every wash. Every wear. Every day.

POLYESTER = PETROLEUM PLASTIC

POLYESTER = PETROLEUM PLASTIC

60–90% of "premium" men's tees are polyester - petroleum-derived plastic. Different logos. Same cheap plastic. You wear it 16 hours a day.

SHEDS MICROPLASTICS EVERY WASH

SHEDS MICROPLASTICS EVERY WASH

Every wash releases hundreds of thousands of plastic particles. Scientists are finding microplastics in places every man should know about.

BUILT TO FAIL. ON PURPOSE

BUILT TO FAIL. ON PURPOSE

Cotton sags. Polyester stinks. Both fall apart in 6–12 months by design. That's how they keep you buying $150–$200/year. Forever.

THE ORIGIN STORY

HE BUILT SOMETHING TOXIC. THEN BURNED IT DOWN.

THE ORIGIN STORY

HE BUILT SOMETHING TOXIC. THEN BURNED IT DOWN.

Chuckie spent years building what he thought was the world's toughest tee. First version: hemp-polyester. Strong - but loaded with PFAS.

Then he and his wife Shelby started trying to start a family. He went deep into research on male fertility. That's when he found the studies.

"Microplastics. PFAS. Endocrine disruptors. The research was undeniable. I was literally selling men a shirt that could be working against them. So I burned the whole thing down and started over."

Chuckie, Founder of UndrDog Hemp

Almost a year and $300,000 later - UndrDog was rebuilt from scratch. Hemp. Bamboo. Organic cotton. Zero polyester. Zero shortcuts.

WHAT THE RESEARCH SHOWS

SCIENTISTS
ARE FINDING MICROPLASTICS
IN PLACES MEN DON'T WANT THEM

HUMAN TESTS

HUMAN TESTS

2024

Scientists detected microplastics - including polyester-derived PET - inside every human testicle they tested.

Zhang et al. (2024) / PubMed ID 38745431

HUMAN BRAIN TISSUE

HUMAN BRAIN TISSUE

2025

Early research in Nature Medicine detected microplastics - including polyester-type PET - in human brain tissue samples.

Britt et al. (2025) / Nature Medicine

CARDIOVASCULAR

CARDIOVASCULAR

2024

Research found micro- and nanoplastics in human artery plaques, associated with higher incidence of heart attack, stroke, and death.

Marfella et al. (2024) / PubMed PMID 38426974

THE TECHNOLOGY

PATENT-PENDING DURAFLOW™

Not a coating. Not a gimmick. Built into the structure of the fiber itself - permanent.

51%

HEMP

Earth's strongest natural fiber. 4x stronger than cotton. Holds shape for life.

31%

BAMBOO

Micro-gap structure creates constant natural airflow. Wicks sweat. Natural antimicrobial - odor never sticks.

18%

COTTON

Chemical-free softness. No PFAS. No coatings. Feels like a man-hug - gets better after every wash.

Doesn't Rip. Doesn't Stretch.

Hemp's tensile strength survives job sites, gym sessions, and years of washing without losing shape.

No Sweat Pits. No Stink.

Bamboo's provides micro gaps + it's natural properties.

Gets Softer with Every Wash

DuraFlow™ fibers soften over time while maintaining structural strength - unlike polyester which sheds.

Zero Microplastic Shedding

100% plant-based. Zero petroleum. Zero synthetic fibers. Zero plastic released in the wash - ever.

The Details

WHAT WE
OBSESSED OVER

Every detail engineered so an
average build looks solid.
Nothing left to chance.

Stitch Density

Stitch Density

Fabric Drape

Fabric Drape

Hem Curvature

Hem Curvature

Arm Taper

Arm Taper

Stretch Recovery

Stretch Recovery

Collar Snapback

Collar Snapback

Chemical Free

Chemical Free

Durability

Durability

Airflow Mesh

Airflow Mesh

Gut Hiding Fit

Gut Hiding Fit

Odor Prevention

Odor Prevention

Wash Durability

Wash Durability

RESULT?

A shirt that gives you insane confidence and changes how you carry yourself.

PROOF

WE DON'T MAKE CLAIMS. WE DESTROY THEM

We put UndrDog through tests other brands wouldn't dare try.

Here's what happened.

TEST 1

Fire Test

Polyester melts into toxic goo.

UndrDog burns clean like a campfire.

One's plastic. One's plants.

Fire Test
TEST 2

Fog Test

Blasted fog under both shirts.

Polyester trapped it.

Heat stays in. UndrDog? Fog flows straight through.

300% more breathable than cotton.
Fog Test 300% more breathable than cotton.
TEST 3

BB Gun Test

Fired at a balloon inside each shirt.

Other shirts? Shredded. UndrDog? Balloon survived.

4x stronger than cotton.
BB Gun Test 4x stronger than cotton.
TEST 4

Pool Float Test

Throw it in a pool. While other shirts soak up everything, ours floats.

DuraFlow™ moves moisture out instead of trapping it.

No sweat patches. No stink. No soaked-through look by noon.

Guaranteed for life.
Pool Float Test Guaranteed for life.
THE CUT

BUILT FOR REAL MEN
NOT MODELS

We engineered the Alpha Frame™ so an average build looks solid. Grips where it should. Hides where it should.
1
Arms & Chest: Hugs Close
Makes arms look bigger, chest look fuller.
2
Midsection: Slightly Looser
Hides the gut and man-boobs without looking like a tent.
3
Curved Hem
Adds visual height and proportion. Clean tucked or untucked.
4
Midweight Fabric
Holds shape all day. No saggy mess by 3 PM.
HEAD TO HEAD

EVERY INTERNET TEE BRAND
VS. UNDRDOG HEMP

Check the tag. It's all polyester. Different logo. Same plastic.

Every Internet Tee

Material

Hemp • Bamboo • Organic Cotton

Polyester
(petroleum plastic)

Plastic on Skin

Zero. None

60–90% plastic fibers

PFAS / Toxic Chemicals

Zero

Extremely common

Microplastic Shedding

None - ever

Every single wash

Breathability

DuraFlow™ Natural Airflow

Synthetic wicking only

Odor Resistance

Natural antimicrobial

Bacteria clings to plastic

Durability

Lifetime Warranty

6–18 months

Fit Design

Alpha Frame™ for real men

Built for the model

5-Year Cost

$38 (once)

$420–$750

Guarantee

Lifetime. No exceptions

30 days. Maybe.

A CHANCE TO WIN

BUY A TEE WIN ACTUAL GOLD

1 in 100 contains a real gold bar

Every UndrDog order ships with a chance. Literally 1 in 100 packages contains a real gold bar. Not a voucher. Not a coupon code. Physical gold - right inside your package.

REAL MEN. REAL REVIEWS.

3,640+
VERIFIED BUYERS ALREADY SWITCHED

Showing 6 of 3,640+ verified 5-star reviews
— 4.9★ average.
$38 Once.  Or $750.

Your Call.

The "Normal Tee" — 5-Year Cost

Average tee spend per year $80–$150/yr
Average lifespan 6–12 months
Total over 5 years $400–$750
Total Wasted $420–$750
📐

One UndrDog Tee = $38

Backed by a lifetime warranty. Rips, stretches, fades, loses shape - we replace it free.

🧮

That's About $0.02 Per Day

Over 5 years, one UndrDog tee runs 2 cents per day. The premium tee you replaced it with? $0.40/day.

🏆

Best Case: Never Buy a Tee Again

Men who buy UndrDog don't come back because theirs wore out. They come back for more colors.

Buy Once.

Wear for Life.

Really.

If your UndrDog tee ever rips, stretches, shrinks, fades, or stops performing - we replace it. Free.
No questions asked. No expiration date. No fine print.

Worst case: you don't love it and we make it right. Best case: you never think about buying a tee again.

LABOR DAY SPECIAL OFFER

EARTH’S LIFETIME TEE:

HEMP. BAMBOO. NO PFAS. GRIPS ARMS. HIDES GUT.

EARTH’S LIFETIME TEE:

HEMP. BAMBOO. NO PFAS. GRIPS ARMS. HIDES GUT.

My go-to-gear!

"This is my go-to-gear for keeping microplastics off my skin. Super comfortable, durable, breathable and comes with a lifetime warranty."

Dave Asprey

Dave Asprey

The Father of Biohacking

1 in 100 Gets Free Gold Bar
Choose Your Size:
Snug fit = usual size, relaxed fit = size up
LABOR DAY SPECIAL OFFER
Select Pack:
1 in 100 wins a gold bar
🎉 Labor Day Sale Savings auto-applied.

Pre-order your UndrDog Hemp to get the next available batch. Next batch ships:

July 22 SOLD OUT
September 09 96% SOLD
November 12 0% SOLD
Buy 3+ for FREE Shipping

Lifetime Warranty
Material

UnderDog Hemp: 51% Hemp, 31% Bamboo, 18% Organic Cotton

No PFAS, microplastics or cancerous chemicals.

Crafted with DuraFlow™ tech - blends hemp’s strength and bamboo’s breathability into a satisfying forever-shirt without forever-chemicals.

  • Weight: Midweight comfort with max airflow
  • Stronger Wear: 4x stronger than cotton
  • Super Breathable: Stay cool with Bamboo airflow
  • Moisture-Wicking: Draws sweat, stay dry
  • Holds Shape: No sag or stretch for 30 years
  • Wrinkle-Resistant: Easy low maintenance
  • Eco-Smart: All natural fibers–No plastic
  • Comfort Level: High comfort that lasts
  • Fade-Resistant: Holds color, no fading
  • Affordable: Outlasts 10 ordinary tees
  • Sun-Safe: Natural UV protection
  • Hypoallergenic: Allergy & irritation-free
Size & Fit
  • Fit: Perfectly tight on the arms and chest, loose around the gut. Look jacked regardless of your size.

  • For a slightly relaxed fit, we recommend using your usual size. For a snug fit, size down.
Washing

Just wash and dry it like any other shirt—no special care needed. The fabric's durability and shape retention stay strong, even after multiple washes and machine drying on low heat.

Lifetime UndrDog Warranty

Don’t like the fit? Don’t like the material? Simply contact support@undrdoghemp.com for an easy return. Unmatched Lifetime Warranty. Yep… we’re that cocky confident.

Are There Other Colors? How does UndrDog Work?

This is “Project 001: Midnight”. The only project available to the public. It’s UndrDogs’ Coat-of-Arms. After purchase, you’ll join thousands in the Undrdog collective with unlocked access to future ‘limited edition’ projects (different colors, styles, designs, etc).

Use size chart below for slightly relaxed fit.
For snug fit, size down.

Size Chart

Real gold. Real odds.

1 in 100 comes with
A FREE 1g gold bar

Gold Bar

1g of .9999 fine gold

Worth ~$200 (based on spot price)

Randomly inserted 1 in 100

Delivered straight in the order package

No purchase necessary, see details below

View Full Terms & Conditions

Customer Reviews

Frequently Asked Questions
I Dare You To Ask…

Will it be comfy?

How can it be breathable AND durable?

What makes it odor/stink free?

Just normal washing?

What's so unique about DuraFlow™?

Why use hemp, bamboo, and cotton?

Lifetime warranty—really?

What makes it wrinkle-free?

How sustainable is this shirt?

What’s UndrDog’s big vision?

Trusted by 350,000 Men
Become An UndrDog
Lifetime Warranty
Buy 3 = Free Shipping