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Micro Modal V-Neck Back & Underarm Sweat Proof Undershirt

12 reviews
Size Guide


  • Does leaning back against your seat give you anxiety?

    Feeling beads of sweat roll down between your shoulder blades to the small of your back can lead to embarrassing pools of sweat on your shirt and the top of your pants.

    You shouldn’t have to bring extra shirts with you to work. You shouldn't have to slather your back with chemical antiperspirants. You shouldn’t have to drape a towel over your seat to hide pools of sweat.

    The back sweat proof undershirt from Ejis brings the same sweat blocking power of our sweat proof undershirts and expands it to cover your entire back.

    That’s over 600 square inches of coverage.

    No more sticking to seats.

    No more changing shirts in the toilet cubicle at work.

    No more hiding your back from clients and co-workers.

    Just a bone dry shirt, no matter how much you sweat.

  • LARGE ONE PIECE WATERPROOF LAYER stops sweat from transferring to your shirt. Think of it as your never-fail backup to antiperspirant deodorant, durable enough to be washed over and over and chemical free.

    ENTIRE BACK PROTECTED with a waterproof layer that stops sweat from transferring to your shirt. With the sweat proof protection starting at the collar and travelling down the entire back as well as under each arm, the back sweat undershirt has you covered.

    STOP SHIRT SWEAT MARKS with Ejis waterproof undershirts that extend the life of your dress shirts by eliminating yellow stains caused by antiperspirants.

    SILVER COMBATS ODOR-CAUSING BACTERIA. Silver is permanently bound to the fibers of our sweat proof undershirts, to keep you fresher for longer.

    SUPER PREMIUM MICRO MODAL FABRIC is 2x softer and 50% more water-absorbent than cotton. With 5% Spandex to add stretch, it will possibly be the most comfortable men's undershirt you've ever worn.

    STAYS TUCKED IN with added length. The slim fit design keeps the protective area snugly up against your armpits, and your back, so sweat doesn’t you don’t want it.

    WHAT THIS UNDERSHIRT WON'T DO is make your sweat disappear. Unfortunately, we can’t stop sweat from happening. It may feel damp on your back and under your arms but sweat stains won't show on your shirt when you wear this powerful no sweat undershirt.

    Why Ejis?

    We founded Ejis based on the belief we could make you feel more confident by solving two of your most embarrassing problems, sweat marks, and odor. We've woven intelligent design, world class functionality, and unrivaled comfort into our undershirts to give you what we call "Wearable Confidence."

    The Ejis sweat proof undershirts were engineered from the ground up specifically for the exceptional man who wants an unfailing, discreet solution to sweat marks and bad odor. Join the thousands of men who are now able to wear what they want because of their Ejis undershirts.

  • We ship to the U.S. & Canada. Visit the COVID-19 Update webpage for up-to-date details about international shipping.

    U.S. Shipping

    Standard Shipping FREE (arrives in 3-10 business days from day of shipment)
    Expedited $9.99 (arrives in 2-3 business days from day of shipment)
    Priority $29.00 (arrives in 1-2 business days from day of shipment)

    Orders are processed at our Utah, USA based warehouse within 24 hours of being placed.

    Priority and expedited shipping are not available for P.O. Box addresses. Buyers with orders shipped to Alaska and Hawaii are charged domestic shipping rates.

    International shipping may be delayed due to the pandemic. Visit the COVID-19 Update webpage for up-to-date details.

    Canada Standard International Shipping

    $9.99 for the first unit Plus $3.00 for each additional unit (e.g. two units would be $9.99 + $3.00 = $12.99). The international shipping rate does not include any customs, duties & service fees that may apply upon delivery.

    Most orders arrive in a week, but they can take up to 20 business days depending on customs delays and local postal services. Both of which are outside of our control.

    Canada FedEx International Economy:


    FedEx International Economy shipments arrive in 3-5 business days from date of shipment but can take longer depending on customs delays, which is outside our control.

  • First Product Guarantee

    Buy one undershirt and one pair of boxers and try them out risk-free! If you don’t love them, we’ll send you a different size or issue a refund. No return required. Visit the FAQs for details.

    Satisfaction Guarantee 45-day Return Policy

    If it’s not covered by our First Product Guarantee, we’ll still issue a refund or process an exchange for orders returned to us within 45 days of purchase. We don’t resell items that have been tried on (because no one wants to buy used underwear) so all returned items must be unopened, unworn, unwashed, containing the tags and are folded neatly inside the original, packaging that is not torn, ripped or cut open. Visit the FAQs for details.

It will actually work for you. Or your money back.

Frequently Asked Questions

What does sweat proof mean?

Our sweat proof undershirts and boxer briefs are engineered to prevent sweat stains. Can we stop you from sweating? Heck no! But we can keep sweat marks from appearing on the armpit of your dress shirts and the seat of your pants.

What if it doesn’t work?

You get a full 45 days from purchase to put your first undershirt to the test to make sure it really works for you just like it does for tens of thousands of other men. If you feel it’s not right for you just let us know and we’ll give you a refund. Valid for single units only. Multi-packs are eligible for our Satisfaction Guarantee 45-day Return Policy. See the FAQ more details.

How does a silver-infused undershirt fight odor?

Bacteria cause odor, and silver has anti-odor properties. We infuse silver particles into our fabrics to help fight that odor-causing bacteria. Our odor-resistant undershirts are scientifically engineered to keep your shirts smelling fresh. Each of our anti-odor undershirts includes this powerful technology, as do our odor-fighting socks and sweat-proof underwear.

Where do these shirts get their sweat-fighting superpowers?

It might look like just an undershirt, but there’s a lot of technology behind our design. We begin with a soft, moisture-wicking micro modal pad fused with silver to fight odor-causing bacteria. We then add a durable waterproof layer to help defend your dress shirt from sweat, and finish with a super comfortable outer layer. The result is an undershirt with a sweat-proof barrier that keeps sweat from showing through to your dress shirt, and stops sweat marks or deodorant marks.

Customer Reviews
5.0 Based on 12 Reviews
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Filter Reviews:
    Andy K.
    United Kingdom United Kingdom

    Exactly what I have been looking for. No sweat visable on outer garment, the garment is perfect, just what I needed.


    Hi Andy, Thank you for leaving a review! I am so happy to hear that your Ejis undershirt is exactly what you've been looking for! Have a great day, Merrielle Ejis Customer Support

    kamruz z.
    United Kingdom United Kingdom
    Life saver

    I am really impressed with this product, the undershirt is a great fit, and true to its word, it keeps the sweat on my back in. The sweat does not show up on my shirt. I have had problems with back sweats for a very long time, which has made life a misery especially in work settings. This undershirt is excellent and I will be making more purchases. Thank you Ejis.


    Hi Kamruz, Thank you for sharing your experience. I am so happy to hear that your Ejis undershirt is keeping you confident and free from sweat marks! Have a great day, Merrielle Ejis Customer Support

    A Ejis Customer
    Justin D.
    United States United States
    Ejis Sweat-Proof Shirts & Boxers are a Necessity!!!

    I have always been a warm guy, always sweating, always running hot and unable to control my body temperature. Dr's can't seem to figure me out so your shirts and boxer briefs are a business person's dream in my situation. Your products allow me to not "ONLY" wear black shorts/ jeans or black shirts to hide my sweat. I can rock salmon, blues, etc and it is amazing. I used to speak in front of large groups of business owners for work in warm environments and I would always be more concerned if I had butt sweat marks on my khakis or jeans than my presentations or speeches. EJIS is my go to going forward. Thank you for making these products. My only suggestion is making the front of the undershirts the same as the armpits and back, bc If I pick up my kid or fold my arms my shirt then does get wet from sweat on my chest. Thanks again


    Hi Justin, Thank you for sharing your experience. I am so happy to hear that your Ejis products are your go-to for keeping you dry and confident. We appreciate the suggestion for making the front of the undershirts sweat proof. I will send this on to our product development team. Have a great day, Merrielle Ejis Customer Support

    Mark D.
    United States United States

    Positively no sweat made it to my shirt, even in hot, humid Midtown on a June afternoon


    Hi Mark, Thank you for leaving a review. I am so happy to hear that your Ejis undershirt kept you dry all afternoon! Have a great day, Merrielle Ejis Customer Support