4.7 Loved by 35,000+ Guys

Black V-Neck Undershirt

From $38.00

Designed to be discreet, especially if you like to wear your collared shirts with a couple buttons undone. Made for all-day comfort. Stay tucked and enjoy anti-odor protection with an incredibly soft, breathable feel.

FABRIC FEATURES

  • Perfect Fit & Style
  • Buttery Soft
  • Built to Last
  • Stay Cool & Fresh
  • Perfect Fit & Style
Size & Fit Guide

🎉

Over 96% of new customers keep theirs — because they love the fit.

1 shirt $38.00 per shirt
4 pack $32.00 per shirt
(Save $24.00)
6 pack $28.50 per shirt
(Save $57.00)
Best Value 10 pack $24.75 per shirt
(Save $132.50)

👉

Mix and match any undershirts to build your own multi-pack. Your discount applies automatically at checkout.

OUR 365-DAY COMFORT GUARANTEE

365 days. That’s how long you have to decide if UnderFit is your most comfortable undershirt. If it ever lets you down — collar, seams, or comfort — we’ll make it right.

SIZE & FIT
MATERIALS & CARE
TOP 5 BENEFITS

Confidence Starts
with the First Layer

Most undershirts are loose, bulky, and ride up throughout the day, trapping heat and adding unnecessary bulk. UnderFit solves these problems. Once you try it, you’ll never go back.

  • Stays Tucked – No adjusting needed.
  • Moisture-Wicking – Stay cool and dry.
  • Tailored Fit – No bulk under your shirt.
  • Ultra-Soft & Lightweight – All-day comfort.
BUILD MY PACK + SAVE UP TO 25%

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:

Build My Perfect Pack

  • 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.
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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.

Find My Fit

  • 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 ProModal fabric, a highly-sustainable textile sourced from Beech Wood chips derived from the Birch Tree. The trees are sustainably farmed and our manufacturing process is “closed-loop,” meaning there is little to no waste.

Build My Perfect Pack

  • All-day breathability. Soft, light, and flexible.
  • Excellent durablility. No pilling after extended wear.
  • Wicks 50% more moisture than cotton.
  • 1/20th the environmental impact of cotton.
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You’re A Reviews Person? We Got The Receipts

Menswear experts universally praise the Invisible Undershirt

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-review
Tug

Verified Buyer

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

gents-review
The Gents Staff

Verified Buyer

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-review
Valet Staff

Verified Buyer

The Fit

The Best Fit or Your Money Back

Every UnderFit undershirt comes with a 365-day risk-free trial. If it’s not the best undershirt you’ve ever worn, we’ll make it right — no questions asked.

  • 35k+

    Guys Trust Underfit

  • 175k+

    Undershirts Sold

  • 100%

    Hassle-Free Returns

Frequently Asked Questions

If we haven’t answered your questions here, hit our chat or email us at service@woocommerce-736936-2725800.cloudwaysapps.com

TENCEL™ Fabric Feel

What makes it an invisible undershirt? Why is it beige?

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

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 630 Reviews
5 ★
82% 
517
4 ★
11% 
67
3 ★
3% 
21
2 ★
1% 
5
1 ★
3% 
20
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Filter Reviews:
EC
11/29/2025
Eric C.
US

Amazing

These are the best undershirts I've ever had. Great texture and feel, lightweight and hidden from view when worn with an open collar. Worth the price.

MB
11/10/2025
Michael B.
US US

Zero customer service

Do not purchase from them. Unless you are absolutely sure of your size and if you like the shirt. I used their size guide and it was not correct. Contacted them multiple times and have received zero response. Tried to use on of the shirts to see. The arms rode up all day and the V in the V neck was uncomfortable. Guess I will go back to Tommy John.

JM
11/08/2025
John M.
US US

Best T Shirt

Finally a great fitting T shirt. Perfect under a light weight sweater

EM
11/07/2025
Elder M.
CA CA

Appalling service.

Notified it was delivered when it hadn’t been. Reached out through all the channels including the “personalized” one resulting in no response at all for ages. Totally unacceptable.

AH
11/05/2025
Andy H.
US US

Didn’t fit and won’t respond to exchange request

Seems like a decent product but post sale customer service is extremely poor. After getting a short email response asking about the sizing when I reached out to exchange it’s been radio silence for over two weeks as I’ve tried to exchange. At this point I’m ready to dispute the charge if they won’t issue a refund and take the shirts back that are too small.