The Clean Fit Tee
The Clean Fit Tee
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365-Wear Guarantee
FREE SHIPPING OVER $60
Free Returns & Exchanges
Shipping & Warranty
Shipping & Warranty
SHIPPING
How fast will I receive my order?
Standard US shipping: 1–7 business days. You'll receive a tracking
number as soon as your order ships.
Is shipping free?
Free shipping on all orders above $60.
WARRANTY
The 365-Day Wear Guarantee
Wear it every day for a year. If the collar stretches out, the fabric
pills, it shrinks, fades, or lets you down in any way — we replace it or
refund you. You keep the tee either way.
No forms. No hoops. No questions asked.
Material & Care
Material & Care
Fabric: 100% Cotton.
Dyes: Non-toxic and OEKO-TEX® certified, safe against your skin,
all day, every day.
Care: Cold wash, tumble dry low. Holds its size and shape wash after wash.
Size Guide
Size Guide
Trusted by Experts
Recommended by trainers, stylists, dermatologists & textile professionals
“I coach twelve hours a day in a hot gym. I’ve thrown out more shirts than I can count because the smell never came out, no matter the detergent, no matter how many washes. That isn’t sweat. That’s the fabric holding onto it. Cotton lets it go.”
Marcus Hale
Strength & Conditioning Coach
“Most men walk in convinced their body is the problem. It almost never is. It’s the cut. A shirt that sits on the shoulder and skims the middle changes how a man reads more than six months in the gym will. That’s the entire job.”
Julian Reyes
Menswear Stylist
“Your skin is against fabric sixteen hours a day. Synthetics trap heat and moisture right at that contact layer, and that’s where irritation starts. For anyone who reacts easily, switching to a natural fiber is the simplest change with the most consistent result.”
Dr. Adrian Cole, MD
Dermatologist
“I’ve developed knits for fifteen years. Polyester isn’t a performance choice, it’s a cost decision. It’s cheaper than cotton, it hides sloppy knitting, and it holds its shape just long enough to get past the return window. A 220 GSM cotton costs more to make and lasts for years. That’s the whole story.”
Nina Okafor
Textile Developer, 15 years in knitwear
What nobody told you about your underwear.
What you're wearing is working against you. Every single day.-
MICROPLASTICS
That boxer you've worn for years? It's shedding microscopic plastic particles directly against your most absorbent skin — 24 hours a day. Polyester is melted plastic. Every movement, every wash, every hour releases microplastics into your body. You just didn't know.
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TOXIC DYES & FINISHES
Daily chemical exposure at your most hormone-sensitive skin. BPA and phthalates mimic and block hormones — lowering testosterone, disrupting reproductive health. Most underwear brands use cheap synthetic dyes. Nobody reads the label.
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SWAMP ASS
You're adjusting before lunch. That sticky, humid feeling that follows you everywhere. Polyester traps heat, blocks airflow, and turns your underwear into an overheated environment where bacteria thrive. Heat also accelerates chemical release from synthetic fabric — making everything worse at once.
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CHAFING
That redness at the end of the day isn't normal. It's not your skin, it's not your body type — it's friction from a boxer that was never built for how you're actually built. A 3-inch inseam bunches between your thighs the moment you move. Great Build's flat seams and 7–8 inch long leg cut eliminate the contact point entirely. No bunching. No friction. No chafing.
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CONSTANT RIDING UP
You've adjusted in public more times than you can count. You assumed that was just how it is — your thighs, your body type, your problem. It's not. Standard boxer briefs have a 3–4 inch inseam. The moment you move, the fabric has nowhere to go but up.
Zero risk
Wear them for a full year, risk free.
Free shipping. Free returns and exchanges.
FAQs
How long until I see results?
How long until I see results?
Most customers notice a difference within 1-2 weeks.
WHAT IS THE 365-WEAR GUARANTEE?
WHAT IS THE 365-WEAR GUARANTEE?
Wear them every day for a year. If they ride up, fade, lose shape, or let you down in any way — we replace them or refund you. You keep the boxer either way. No forms. No hoops. No questions asked.
How should I size?
How should I size?
Size up if you're between sizes. Great Build fits true to waist but the priority is the thigh — if you're built bigger through the legs, go up one size for the right fit. Some shrinkage is normal after the first wash, so sizing up gives you the perfect post-wash fit.
How long does shipping take?
How long does shipping take?
Standard US shipping: 1–7 business days. Free shipping for order above $40. You'll receive a tracking number as soon as your order ships.
I HAVE BIG THIGHS. WILL THESE ACTUALLY STAY DOWN ?
I HAVE BIG THIGHS. WILL THESE ACTUALLY STAY DOWN ?
That's exactly who Great Build was built for. Athletic fit, extra room through the thighs, long leg cut. Wear them through a full day — commute, meetings, errands — and you won't adjust once.
WHAT MAKES GREAT BUILD DIFFERENT FROM EVERY OTHER "COMFORTABLE" BOXER ?
WHAT MAKES GREAT BUILD DIFFERENT FROM EVERY OTHER "COMFORTABLE" BOXER ?
Two things no other brand combines: a long leg cut engineered for thicker thighs, and fabric that contains zero plastic, zero toxins. Most "comfortable" boxers are still 80–90% polyester. Ours aren't.
WHAT'S SO BAD ABOUT REGULAR UNDERWEAR?
WHAT'S SO BAD ABOUT REGULAR UNDERWEAR?
Most men's underwear is 80–95% polyester — a fabric made from melted plastic. It releases microplastics, BPA, and phthalates directly against your most sensitive skin, 24 hours a day. These are endocrine disruptors — chemicals that interfere with hormone production. Your underwear is the one thing touching your body every single hour. It matters what it's made of.
IS THE MICROPLASTICS THING REAL — OR JUST MARKETING ?
IS THE MICROPLASTICS THING REAL — OR JUST MARKETING ?
It's real. Four peer-reviewed studies published on the NIH database confirm it:
Microplastics released during washing of polyester fabrics
→ pmc.ncbi.nlm.nih.gov/articles/PMC9000408/
Endocrine disrupting effects of micro and nano plastics
→ pmc.ncbi.nlm.nih.gov/articles/PMC9885170/
Microplastics: A Threat for Male Fertility — testosterone & sperm quality
→ pmc.ncbi.nlm.nih.gov/articles/PMC7967748/
Microplastics exposure: implications for human fertility and pregnancy
→ pmc.ncbi.nlm.nih.gov/articles/PMC10794604/
We didn't build Great Build on a trend. We built it on this.
WHAT IF I DON'T LOVE THEM?
WHAT IF I DON'T LOVE THEM?
Contact us within 365 days. We make it right. That's the guarantee.