Mack Weldon 18-Hour Jersey Boxer Brief

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Micro-Brushed French terry

So you get an ultra-soft feel (that doesn’t fade in the wash).

image of man wearing navy blue sweatpants

Streamlined Fit

So you can wear them anywhere.

close up of the waist band of ACE sweatpant

Perfect Stretch + Recovery

So they’re always comfortable, but never saggy.

close up of ribbed cuff on the ankle of ACE navy blue sweatpant

Back-Ribbed Ankle Cuffs

So they maintain their shape at the hem.

18-Hour Jersey

Our signature blend of cotton, modal, and stretch, tailor-made for exceptionally comfortable underwear and undershirts.

Shop All 18-Hour

Shop All 18-Hour

SHOP THE LOOK

How does the 18-Hour Jersey fabric feel compared to your other boxer brief styles?

The 18-Hour Jersey is the softest option we make, and it's the fabric that built our reputation. It's a balanced weight: substantial enough to feel quality and durable, but not so thick that it feels bulky or traps heat. If you prioritize maximum breathability for hot conditions or sweating, our Airknit style offers more ventilation, but most customers choose the Jersey for its comfort and everyday versatility.

Will the waistband roll down if I have a stomach?

The elastic waistband is designed to stay in place regardless of your body type, and most customers report no rolling even with a fuller midsection. However, some customers with significant belly weight have noted the waistband can fold slightly. If that's a concern for you, sizing up may help, or reach out to our team to discuss the best fit for your body.

Do the leg openings ride up during the day?

The leg length is designed with elastic at the bottom to prevent riding up, and the majority of customers report they stay in place throughout the day regardless of activity. A smaller number have experienced some bunching at the legs, which is typically resolved by sizing up or confirming you have the right fit. Reach out if you want sizing guidance.

Are these good for hot weather or physical work?

Yes, the Jersey fabric wicks moisture and prevents swamping, making them suitable for hot conditions and active work. Electricians and other tradespeople have reported they perform well in 100+ degree environments while staying comfortable throughout the day.

How do I care for the 18-Hour Jersey boxer briefs?

Machine wash and dry; they're designed to hold their shape and stay true to size with standard care. The fabric is durable enough for frequent washing and wearing without losing its softness or fit.

Why We Love 'Em

Why We Love 'Em

18-Hour Jersey

SHOP THE LOOK

18-Hour Jersey Boxer Brief

How does the 18-Hour Jersey fabric feel compared to your other boxer brief styles?

Will the waistband roll down if I have a stomach?

Do the leg openings ride up during the day?

Are these good for hot weather or physical work?

How do I care for the 18-Hour Jersey boxer briefs?

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18-Hour Jersey Boxer Brief

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Size + Fit

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Why We Love 'Em

Why We Love 'Em

18-Hour Jersey

SHOP THE LOOK

18-Hour Jersey Boxer Brief

How does the 18-Hour Jersey fabric feel compared to your other boxer brief styles?

Will the waistband roll down if I have a stomach?

Do the leg openings ride up during the day?

Are these good for hot weather or physical work?

How do I care for the 18-Hour Jersey boxer briefs?

Recently Viewed

18-Hour Jersey Boxer Brief