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Sweat Proof Boxer Brief with Fly

67 reviews
Size Guide

  • A truly great boxer brief offers comfort, design, and functionality – our Ejis sweat proof boxer briefs with fly have all three in spades. Sweaty underwear doesn’t have to ruin your day.

    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 sweat proof boxer briefs to give you what we call "Wearable Confidence."

    Our sweat proof, anti-odor underwear is made with super soft, breathable micro modal material, fused with real silver to fight odor causing bacteria. Combine that with an ultra-thin waterproof layer in the places you need it most, and you get a powerful pair of moisture wicking boxer briefs that keep you dry and comfortable. We added a fly to this design for guys who prefer that style.

    With Ejis boxer briefs, your butt, back of the legs and crotch are all protected with an ultra-thin waterproof layer that stops sweat from transferring to your pants, so you stay looking your best and feeling confident. Forget embarrassing sweat marks on your pants or shorts – this anti-sweat underwear for men is an absolute game changer. Don't be surprised if you try a pair and want to replace your entire underwear drawer.

    All Ejis sweat proof underwear are 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 underwear. Need a different style? Check out our sweat proof boxer briefs with comfort pouch.

    We don't just make clothing, we make Wearable Confidence.

  • EXTRA LARGE COMFORT POUCH - Keep your junk separated and cool, but also have easy access.

    EXTRA WIDE WAISTBAND - No waistband digging in to undo all the comfort the rest of these boxer briefs provide.

    PERFECT LENGTH - Plenty of protection and comfort.

    BACTERIA-FIGHTING SILVER TO COMBAT ODOR - Silver is permanently bound to the fibers of each pair of sweat proof underwear, which keeps you fresher longer. It also helps to regulate your body temperature by pulling heat away from the body when you're hot.

    SUPER PREMIUM MICRO MODAL FABRIC – Twice as soft and 50% more water-absorbent than cotton. With 5% Spandex to add stretch, it will possibly be the most comfortable men's underwear you've ever worn.

    WHAT THIS UNDERWEAR WON'T DO is make your sweat disappear, unfortunately, it's not that good. It may feel damp but it won't show on your pants.

  • 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

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

    International shipping costs are based on live-rates.

    Ejis has partnered with Passport Shipping to handle all international shipments. Thanks to Passport you can now pay taxes and customs/duty fees at checkout so your order won't get stuck in customs and you won't have any surprise fees upon delivery.

    Once your parcel has left the United States, please expect it to take roughly 10-14 business days to arrive in your country. This timeline should be reflected in the estimated delivery date on your tracking page. Visit our FAQs for more information about International Shipping.

  • 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
4.7 Based on 67 Reviews
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    Definitely have my confidence back!

    Tillman M.
    United States

    Thank you!!

    These boxers have finally given me the confidence to not have to worry about sweating through and being embarrassed Game change! Life changing

    Matthew B.
    United States United States


    Hi Matthew, Thank you for leaving a review and sharing your experience. I am so happy to hear that your Ejis boxer briefs have been a game changer for you! Have a great day, Merrielle Ejis Customer Support


    Great Boxers!

    Perfect…no worries

    Mike D.
    United States United States


    Hi Mike, Thank you for leaving a review. I am so happy to hear that your Ejis boxer briefs are perfect! Have a great day, Merrielle Ejis Customer Support


    Bought as gift

    I bought this for my husband as a birthday gift, so far he absolutely loves them. Although I have to admit I kinda bought them for him so he would do me a favor in return...because of the sweat problem and living near the Coachella Valley, during the hot season he tends to shave. And it might be great for his relief of uncomfort, but for me...not so much! :0( So why not us both be happy and content? Thank you for designing such a wonderful product, can't wait to see any future new styles and designs. By the way, we're strong supporters of small businesses, they are the backbone of this great nation ;0)

    Veronica K.
    United States United States


    Hi Veronica, Thank you for sharing your experience. I am so happy to hear that you and your husband are loving his Ejis products! Have a great day, Merrielle Ejis Customer Support


    They work

    Bought for my son and he said they work great!

    Wendy F.
    United States United States


    Hi Wendy, Thank you for leaving a review. I am so happy to hear that your son's Ejis boxer briefs have been working so well for him! Have a great day, Merrielle Ejis Customer Support


    Best boxers ever

    Very good experience no more embarrassing moments at work thanks to Ejis!

    Corey J.
    United States United States


    Hi Corey, Thank you for leaving a review. I am so happy to hear that you have had a great experience with your Ejis boxer briefs! Have a great day, Merrielle Ejis Customer Support


    Great performance

    Works exactly as described, very solid product.

    Justin A.
    United States United States


    Hi Justin, Thank you for leaving a review! I am so happy to hear that your Ejis boxer briefs are performing exactly as described! Have a great day, Merrielle Ejis Customer Support


    Awesome boxers

    Love this boxers. I suffer from sever hyperhidrosis and sometimes I swear too much and you can see the sweat stain on my pants or shorts but not with this ejis boxers, they are awesome. I am so thankful they exist.

    United States United States


    Hi Miguel, Thank you for leaving a review. I am so happy to hear that your Ejis boxer briefs are keeping you confident and free from sweat stains! Have a great day, Merrielle Ejis Customer Support


    Sweat proof

    Bought them thinking the would help with sweating. I figure I try them while working but seem to have a lot more sweat. Kinda uncomfortable. My job isn’t very physical. And sill left wet spot on chair. Not totally satisfied since they were expensive for one pai.

    United States United States

    Works great for my son!

    Keeps the sweat inside so no sweaty shorts!

    Janelle T.
    United States United States


    Hi Janelle, Thank you for leaving a review. I am so happy to hear that your Ejis boxer briefs are keeping your son free from sweaty shorts! Have a great day, Merrielle Ejis Customer Support