90% matchTommy John
Same fit-engineered DTC underwear and undershirt playbook
What changes: Softer natural-feel fabrics and more retail distribution, less activewear
Brand profile
Mack Weldon
New York direct-to-consumer menswear brand making performance-fabric basics — underwear, socks, tees, sweats — sold mainly online since 2012.
New York CityOrigin
MenswearFocus
Minimalist / ContemporaryStyle
$$Price
4 brands like Mack Weldon like Tommy John, Organic Basics, Richer Poorer →
What to know about Mack Weldon
Underwear and socks come first
The range was built around boxer briefs, trunks, undershirts, socks and tees, then widened into sweats, polos, swimwear and activewear rather than the reverse.
Performance fabrics applied to basics
Founded in 2012 to rework men's staples with technical, performance materials and simplified sizing, kept to muted solid colors throughout.
Direct-to-consumer, built for reorders
Sold mainly through its own site, with loyalty rewards and a try-on guarantee designed to turn first purchases into repeat basics restocking.
How Mack Weldon fits
Overall fit
true to size
Most shoppers find Mack Weldon basics run true to size with a clean, modern regular fit that isn't overly slim or baggy.
Tip: Order your usual size; consider sizing up only if you prefer a looser, more relaxed fit.
Medium confidence · based on 6 sources
By category
| Category | Runs | Shape | Size advice |
|---|---|---|---|
| Hoodies & sweatshirts | true to size | regular | Take your normal size; the sweats fit standard with a bit of room for layering. |
| Shirts & overshirts | true to size | regular | Order your usual size for a standard, non-slim fit. |
| T-shirts & graphic tees | true to size | regular, lightly tapered | Stick with your usual size for a fitted-but-not-tight look; size up for a looser drape. |
Directional fit consensus summarized from public sources with AI — a starting point, not a guarantee. Confirm with the product's own measurements before buying.
If you like Mack Weldon
90% match
73% matchOrganic Basics
Minimalist basics system, organic fibres over performance synthetics
What changes: Sustainability-first sourcing and unisex Scandinavian styling
71% matchRicher Poorer
Softer California take on tees, socks and loungewear
What changes: Patterned, casual design language rather than technical solids
67% matchPact
Cheaper organic cotton answer to the same drawer staples
What changes: Cotton comfort and Fair Trade ethics, no performance fabrics
Mack Weldon fit questions
Does Mack Weldon run big or small?
Mack Weldon fits true to size. Order your usual size; consider sizing up only if you prefer a looser, more relaxed fit. Most shoppers find Mack Weldon basics run true to size with a clean, modern regular fit that isn't overly slim or baggy.
How does Mack Weldon fit?
Most shoppers find Mack Weldon basics run true to size with a clean, modern regular fit that isn't overly slim or baggy. Overall shape: regular to slightly slim.
How do Mack Weldon hoodies & sweatshirts fit?
Mack Weldon hoodies & sweatshirts fits true to size. Take your normal size; the sweats fit standard with a bit of room for layering. Shape: regular.
How do Mack Weldon shirts & overshirts fit?
Mack Weldon shirts & overshirts fits true to size. Order your usual size for a standard, non-slim fit. Shape: regular.
How do Mack Weldon t-shirts & graphic tees fit?
Mack Weldon t-shirts & graphic tees fits true to size. Stick with your usual size for a fitted-but-not-tight look; size up for a looser drape. Shape: regular, lightly tapered.
Brand facts
Mack Weldon is a New York direct-to-consumer menswear label founded by Brian Berger in 2012 to rework men's basics with performance fabrics and simplified sizing. The line centers on boxer briefs, trunks, undershirts, socks and t-shirts, and has widened into sweats, polos, swimwear, activewear and accessories in muted solid colors. It sells mainly through its own site, using loyalty rewards and a try-on guarantee to drive repeat orders. Private equity firm North Castle Partners has held a majority stake since 2019.
- Founded
- 2012
- Origin
- New York City, United States
- Made in
- Asia
- Price
- $$
- Focus
- Menswear
- Facts checked
- August 2026
- Styles
- Minimalist / Contemporary, Athleisure / Sportswear