Sweat proof & easy access!

Sweat Defense Boxer Brief | Fly | Sweat Proof Micro Modal

47 reviews

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Our sweat proof micro modal boxer briefs with fly are the best gift you can buy yourself. A truly great boxer brief is all about comfort, design, and functionality, and the Ejis sweat proof boxer briefs have these things in spades.

Our underwear is made with super soft, breathable micro modal fused with real silver to fight odor-causing bacteria and features an ultra-thin water proof layer in the places you need it most.

Your butt, back of the legs and crotch are all protected with our patent pending sweat proof system. Forget embarrassing sweat marks on your pants or shorts. This is an absolute game changer.

These micro modal boxer briefs with fly were made to keep you looking dry, smelling fresh and feeling confident. Don't be surprised if you try a pair and decide these are the most comfortable boxer briefs you’ve ever worn.

Multiple layers work together to stop sweat from reaching your pants. Other men’s boxers of so-called “quick-dry underwear” leave you with sweat marks in the most embarrassing places. Ejis sweat proof boxer briefs works differently to completely block sweat from ever reaching your clothes.

The ultra-thin and silent waterproof layer in each pair of micro modal boxer briefs stops sweat from transferring to your pants, so you stay looking your best and feeling confident.

Powders and lotions can't compare to the unfailing sweat stopping power of the Ejis sweat proof boxer brief system.

It is also durable enough to be washed over and over again.

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

EXTRA LARGE COMFORT POUCH with FLY gives you easy access while keeping your assets separated and cool.

EXTRA WIDE WAISTBAND offers maximum all day comfort.

PERFECT LENGTH gives you plenty of protection and comfort.

SILVER HELPS TO REGULATE BODY TEMPERATURE by pulling heat away from the body. Cooling you when you're hot and keeping you warm when you're cold.

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 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.

Standard 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 next day shipping*

*Orders placed after 2 p.m. MST Monday – Friday will ship the following business day.

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 is available.

$9.99 for the first unit

$3.00 for each additional unit (e.g. two units would be $9.99 + $3.00 = $12.99)

Estimated international delivery time is 6-20 days from date of shipment, depending on destination. We offer the lowest International shipping prices possible, which can increase the shipping time. Our chosen international shipping carrier is less expensive and will reduce the chance that you must pay customs, duties, or taxes on your shipment.

Frequently Asked Questions

How do I prevent underwear sweat?

While sweat proof boxer briefs can’t prevent you from sweating, they’re a good safeguard against embarrassing sweat stains. Check out our blog post for 10 tips to stop sweating.

Are these the best underwear for the gym?

Let’s face it: When you work out, you sweat. It’s unavoidable. Wearing a comfortable pair of underwear can help prevent discomfort. Ejis sweat proof boxer briefs are made of micro modal, a soft, lightweight fabric that’s perfect for exercising.

What is micro modal fabric?

Our sweat proof boxer briefs are made with premium micro modal, a sustainable fiber that is derived from beech trees. Touch it and you’ll understand: The silky soft feel of micro modal is so lightweight you’ll swear they’re the most comfortable boxer briefs known to man. Micro modal is so comfortable and so lightweight we use it in our sweat proof undershirts, too.

Will these underwear keep my thighs and butt dry?

Yes! Most ordinary men’s boxers keep moisture close to the skin. Ejis micro modal boxer briefs are different. We engineered these sweat proof bad boys to prevent sweat stains on your butt and legs.

Customer Reviews
4.4 Based on 47 Reviews
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James M.
United States United States
Best available

I have 12 of these in various colors, so I’m obviously a fan. It’s the best I’ve found at stopping sweat and odor while remaining comfortable. I have several brands that claim to be sweat proof, but these are the only ones I’ve found that keep my clothes dry and aren’t a disguised diaper. The improvements I would suggest are an anti-roll waistband (for the dadbod; which the rolling covers the logo), a way to keep them from riding down during squats, and maybe offering another layer up front since some of us are excessive sweaters in places besides the rear. A trunk or brief would be nice also. Overall, this is great underwear and I’ll continue being a customer.


Hi James, Thank you for sharing your experience! We understand what it's like to have sweat marks come through your clothing, and we created this product to eliminate the negative feeling that goes along with this happening. We appreciate the feedback and I will send it on to our product development team. I am so happy that your Ejis boxer briefs are keeping you sweat stain free! Have a great day, Merrielle Ejis Customer Support

John P.
United States United States
Not a fan

Might work for others, but not for me. Never went beyond tring them on, so can't give a full review. Ordered the size I normally wear, but these gave me plumbers butt. If you are on the edge of a size, go up.

jean-pierre k.
Australia Australia
Very satisfied

EJIS underwear are very comfortable and on hot humid days certainly do as they’re advertised to do. There are no tell tale signs of sweat through trousers...


Hi Jean-Pierre, Thank you for leaving a review. I am so happy to hear that your Ejis boxer briefs are comfortable and keeping you sweat stain free! Have a great day, Merrielle Ejis Customer Support

donald B.
United States United States
Best ever boxer briefs!

Love these briefs! Great fit and blocks little accidents perfectly!


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

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