(4.82) Read Reviews

Black Crew Neck Undershirt

$36.00

Our black crew neck is ideal if you prefer to wear your shirts fully buttoned up. Stay tucked in style and avoid sweat stains with an ultra-soft, breathable feel.

Size & Fit Guide
3 shirt
pack
Save 10%
6 shirt
rotation pack
Save 15%
10 shirt
stockpile pack
Save 25%
Free shipping on orders over $75. Free returns.

THE 100-DAY COMFORT GUARANTEE

We back all of our undershirts with a 100-day guarantee. We’re so confident in them that in the unlikely event that the collar ‘bacon necks’ or a seam breaks, don’t sweat it! We’ll gladly replace it with a new one.

FABRIC FEATURES

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Tailored Fit &
Stays Tucked
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Incredibly Soft
 &
Won’t Pill
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Super
Breathable
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Moisture
Absorbing
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4-Way
Stretch
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Fights Odor
All Day
SIZE & FIT
MATERIALS & CARE
TOP 5 BENEFITS

The Most Comfortable Undershirt You’ll Ever Wear

The moment you put on an UnderFit undershirt, you’ll notice a huge difference compared to other undershirts you’re used to wearing. To design the best men’s undershirts, we analyzed everything we hated about traditional, poorly-made basics. That’s why we set out to make an undershirt that:

  • Works for the office, a night out, or around the house.
  • Features the highest-quality, comfortable fabrics.
  • Stays tucked in all day long (with no “undershirt gut”).
  • Offers anti-odor and advanced moisture absorption.
Slim fit crew neck undershirt moves with you
Crew neck undershirt with gray quarter-zip sweater

A Perfect Fit That Keeps You Cool, Crisp, & Confident

You don’t need a six-pack to rock an UnderFit undershirt. They say clothes make the man. At UnderFit, we know confidence starts underneath.

  • Look slimmer and feel more confident.
  • Stays tucked all day, no matter how you move.
  • Moisture wicking & odor resistant fabric keeps you feeling fresh.
  • Tailored fit hugs your biceps and waistline to eliminate lines and “t-shirt bulk” around your middle.

Ridiculously Soft & Sustainable

You’ll never want to take this undershirt off! Our undershirts are made from TENCEL™ fabric, a highly-sustainable textile sourced from wood chips. The trees are sustainably farmed and our manufacturing process is “closed-loop,” meaning there is little to no waste.

  • All-day breathability. Soft, light, and flexible.
  • Excellent durability. No pilling after extended wear.
  • Wicks 50% more moisture than cotton.
  • 1/20th the environmental impact of cotton.
Crew neck undershirt with button down dress shirt

It’s Easy to See Why People Get Obsessed

Hear it straight from the professionals

Gotta tell you, it’s a very nice product. Good fit, good feel, good price. Comparatively, the UnderFit fits and feels very close (or as nice as) to the more expensive micromodal/lycra undershirts.

Tug
The Undershirt Guy

No rising, No billowing. We managed to get through a whole day without a single untuck from under our made-to-measure shirts.

The Gents Staff
Gents Among Men

The problem with most undershirts is that they’re just T-shirts. UnderFit’s shirts are made from lightweight yet durable fabrics with a touch of stretch and are designed to be worn under your shirts.

Valet Staff
Valet Mag

The Fit

A Perfect Fit. Guaranteed

All of our undershirts are backed by a 100-day guarantee. Don’t love it? Contact us and we’ll make it right.

  • 20k+

    Happy Customers

  • 140k+

    Undershirts Sold

  • 100%

    Free Returns & Exchanges

Frequently Asked Questions

If we haven’t answered your questions here, hit our chat or email us at service@underfit.com

TENCEL™ Fabric Feel

Why do we use our TENCEL™ blend and not cotton?

Should I get a crew neck or a v-neck undershirt?

Why do UnderFit undershirts cost more than cotton basics?

How do UnderFit undershirts stay tucked all day long?

What is the right fabric (moisture absorbing vs wicking) to wear?

What’s wrong with viscose, bamboo, organic cotton or other fabrics?

Where are the shirts made?

Finding The Right Fit

How does it fit?

Will it tighten to pull my belly in?

Will it feel tight?

Customer Service Questions

What if I try UnderFit and don’t like it?

What is your returns policy?

Do you ship worldwide?

Customer Reviews
4.7 Based on 592 Reviews
5 ★
83% 
490
4 ★
11% 
65
3 ★
3% 
19
2 ★
1% 
5
1 ★
2% 
13
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Filter Reviews:
RO
07/12/2025
Ron O.
US US

Terrible customer service

I have sent emails for 4 days asking for a return label to exchange my purchase for a larger size. I have heard nothing from this company. Very disappointed and I will never buy from them again. Buyer beware. Seems like a scam to me.

AN
07/11/2025
Alfred N.
LU LU

Received wrong items

I ordered 2 pairs of boxers but received 2 v-necks instead.

HH
07/06/2025
Hunter H.
US US

Thrilled I Discovered This Brand!

The deep V T-shirts are excellent quality and reasonably priced compared to some other brands. I purchased them for a European vacation coming up next week and trust that they will help keep me relatively dry and looking put together despite extreme heat. What a find!

JF
07/04/2025
Joseph F.
US US

Amazing, and perfect for hot summer days!

The UnderFit undershirts are amazing. I wear them under my casual t-shirts to keep sweat from showing. After walking around in 90+ degree weather, my shirt was completely dry! And I know I sweat because my undershirt was wet. After sitting in a coffee shop for about 15-20 minutes, I went to the bathroom to check, and my UnderFit shirt was dry! No smells, no embarrassing sweat stains, I was so happy. I’m a flight attendant, and will be buying more of these to wear to work now!

TP
07/03/2025
Timothy P.
US US

Best of the Best!

I just received my 3rd, maybe 4th, 10-pack order of V-Neck white undershirts. I usually wear these in the summer, and heavier t-shirts in the winter. They fit great, do not show or bunch under my dress or casual shirts, and they seem to help keep my overshirt tucked in. Couldn't be happier!