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Mack Weldon

Fabric Innovation

Developing better basics starts with fabric innovation. We custom blend the world’s best fibers into even better fabrics—ones that perform as great as they feel.

Our Signature Blends

18-Hour Jersey

Our proprietary blend of cotton, smooth modal, and stretch Lycra®, this fabric sits for 18 hours before it’s cut. That’s how long it takes to naturally expand. The result is a softer feel and more consistent fit.

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Silver

Supima® cotton is the softest and strongest in the world. We made it even better by blending it with antimicrobial Silver XT2®. While we’re one of the first brands to use pure silver in everyday clothing, it’s been used for years by NASA, Olympic athletes, and the U.S. Special Forces to ensure lasting freshness in the harshest of environments.

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AIRKNITx

Our soft, lightweight microfiber maximizes airflow and stretches in every direction. It’s topped off with a moisture-wicking and odor-fighting finish to keep you dry and fresh to the end of your workout or workday.

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Try Our Underwear

Mack Weldon

18-Hour Jersey Boxer Briefs

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Mack Weldon

Silver Boxer Briefs

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Mack Weldon

AIRKNITx Boxer Briefs

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Tops & Bottoms

 
DRYKNIT

DRYKNIT is our 100% cotton jersey, enhanced with patented TransDRY® technology—proven to wick and vaporize moisture, keeping you up to 2 degrees cooler. Imagine all the softness of your favorite cotton tee, complemented by the superior performance of an athletic shirt.
 

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WARMKNIT

Thermolite® is a hollow-core fiber that traps heat without adding weight. We blended it with smooth modal and just enough moisture-wicking, odor-fighting wool, all in a micro-waffle knit with a touch of stretch.
 

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Performance Stretch

Built for mobility and utility, our high-stretch fabric helps you comfortably power through your most active days.
 

Shop Radius

 
37.5® Tech

Our fabric is powered by 37.5® technology, whose active particles help regulate your body temperature and the microclimate next to your skin. With spandex for high stretch, this ultra-responsive blend meets your needs in any workout—so you can run, lift, or stretch without distractions.
 

Shop Stratus Short

Shop Tops & Bottoms

Mack Weldon

DRYKNIT Pocket Tee

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Mack Weldon

WARMKNIT Long Sleeve T-Shirt

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Mack Weldon

Radius Pant

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Mack Weldon

Stratus Short

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Quick-Dry Stretch

We developed a light, soft, and smooth blend that dries quickly, pulling moisture away from the interior for a comfortable and cling-free wear on land. Plus, it’s equipped with four-way stretch that moves with you, from the beach to the boardwalk to the hotel bar.

Shop Swimsuits

 
Nylon Aquarius

Even great swimsuits don’t offer the support or comfort of great underwear. But traditional underwear fabrics shouldn’t be worn in the water. So we engineered something new. It’s soft, smooth, and quick-drying.
 

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Shop Swim

Mack Weldon

Board Short

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Mack Weldon

Swim Trunk

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Mack Weldon

Amphibious Underwear

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Water-Resistant Industrial Twill

Engineered with a sturdy, water-resistant industrial twill fabric, the interior lining is then fused with antimicrobial silver ions that resist odor and keep your stuff fresh.
 

Shop Ion Collection

 
Water-Resistant Waxed Canvas

When you want tough fabric, look no further than waxed canvas—it’s built to brave the elements and look damn good doing it. We added a rubberized bottom for extra protection against sidewalks, subway floors, and airport curbs.
 

Shop GTX Collection

Feel It to Believe It

Try it on. If you don’t love it, let us know, and we’ll help you find the right fit. Free shipping over $50 and free returns always.

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