8 October 2026International edition
Vol. I · No.
8 October 2026
AI in Fashion
DAILY
The daily briefing on AI in the fashion business
Where fashion meets artificial intelligence.
Digital-native and DTC brands

Mack Weldon

United States

Mack Weldon is a New York-based menswear brand founded by Brian Berger, built on essentials such as underwear, tees and loungewear. It started with the 18-Hour Jersey Boxer Brief and expanded to wider menswear basics. Its founding year and ownership could not be verified.

Facts
FounderBrian Berger
HeadquartersNew York
Hero product18-Hour Jersey Boxer Brief
SegmentDigital-native and DTC
CategoriesUnderwear, tops, bottoms, accessories
Websitemackweldon.com
Segment
Mid-market
Categories
MenswearAccessories
Sales channels
E-commerceOwn stores

What is Mack Weldon?

Mack Weldon is a New York-based menswear brand that sells everyday essentials direct to consumers. Its website names Brian Berger as founder and chief executive and says the brand has grown over a decade-plus, without giving a year.

History

According to the brand's story page, Berger was frustrated by the varied fit and quality of department-store underwear and wondered why such an essential item was so hard to buy. That led to the 18-Hour Jersey Boxer Brief. The brand then applied the same approach to other menswear staples.

Products and positioning

The website lists four main categories: tops (T-shirts, polos, hoodies, button-ups, sweaters, jackets and undershirts), bottoms (sweatpants, shorts, pants, lounge and swim), underwear, and accessories (socks, bags, belts and gift cards). Offers include a Try On Guarantee for underwear, free shipping over 150 dollars and a rewards programme.

Business model and distribution

Mack Weldon is primarily an online brand, with a store locator on its website that indicates some physical retail presence. Store numbers and locations were not available from the pages consulted. Wholesale and marketplace sales could not be verified.

What could not be verified

The sources fetched do not state the founding year or owner. Only the official website could be fetched for this profile, so no further detail is added.

Why it matters

Mack Weldon is part of the first wave of direct-to-consumer menswear brands that began with a single hero product and a focus on fit and fabric, before widening into a full essentials wardrobe.

Frequently asked questions

Who founded Mack Weldon?

Brian Berger is described on the brand's website as its founder and CEO. He started the brand after becoming frustrated with the quality of department-store underwear.

Where is Mack Weldon from?

Mack Weldon is a New York-based American menswear brand.

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