# Mack Weldon

> Mack Weldon is a New York menswear company selling premium underwear, socks, tees, sweats and other wardrobe essentials. Founded by Brian Berger and Michael Isaacman, it combines proprietary fabric blends and comfort-focused design with ecommerce, stores and wholesale distribution.

- **Founded:** 2011
- **Headquarters:** New York, United States
- **Founders:** Brian Berger (Co-founder and CEO), Michael Isaacman (Co-founder)
- **Products:** 18-Hour Jersey, Silver, Ace Collection, Vesper Polo, AIRKNITx
- **Notable:** Opened its first company store at Hudson Yards on March 15, 2019., More than one million Ace sweatpants sold, as reported by Glossy in August 2025., Ace represented 25% of 2024 revenue and around 10% of assortment, according to August 2025 reporting.

## Products & services

- **18-Hour Jersey** — Underwear and undershirts in a cotton, modal and spandex blend; part of the original collection.
- **Silver** — Underwear and tees incorporating XT2 silver fiber for the brand’s advertised odor-management benefits.
- **Ace Collection** — Micro-brushed French terry sweats and adjacent menswear; expanded into bomber jackets in August 2025.
- **Vesper Polo** — Breathable micromesh polo with stretch and a shape-retaining collar.
- **AIRKNITx** — Performance underwear, tees and socks introduced with an Equinox retail partnership.
- **Swimwear** — Stretch trunks and board shorts launched with quick-drying materials and a waterproof zip pocket.
- **Jeans** — Denim added as the company broadened its product mix.

## Achievements

- Opened its first company store at Hudson Yards on March 15, 2019.
- More than one million Ace sweatpants sold, as reported by Glossy in August 2025.
- Ace represented 25% of 2024 revenue and around 10% of assortment, according to August 2025 reporting.

## Latest updates

- **2025-01** — Launched Comfortable Anywhere TV campaign after rebuilding digital marketing and tightening first-order profitability requirements.
- **2025-04** — Announced underwear price lock through July 4 and a temporary $14.50 18-Hour Jersey promotion for April 24-27.
- **2025-06** — Brian Berger discussed customer acquisition, customer feedback and omnichannel strategy on NRF’s Retail Gets Real.
- **2025-08** — Ace expanded into bomber jackets; Glossy reported its contribution to acquisition and repeat purchases.
- **2026-10** — Website observed promoting Quilted Rib, Broken Twill and Vintage French Terry; this is a site observation, not a verified launch date.

## Links

- Website: https://mackweldon.com/
- LinkedIn: https://www.linkedin.com/company/mack-weldon/
- Twitter/X: https://twitter.com/mackweldon
- YouTube: https://www.youtube.com/user/mackweldon/featured
- Instagram: https://www.instagram.com/mackweldon/
- Facebook: https://www.facebook.com/MackWeldonUnderwear/

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Profile page: https://yespress.io/mack-weldon
Published by YesPress — https://yespress.io
Last updated: 2026-10-04