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1. This underwear solves problems.

Mack Weldon’s underwear doesn’t miss a trick. It’s designed with a waistband that won’t roll over, and legs that stay put without feeling constricting. Better underwear, less complaining about said underwear.

Double-sided fly
For righties and lefties alike

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1. This underwear solves problems.

Mack Weldon’s underwear doesn’t miss a trick. It’s designed with a waistband that won’t roll over, and legs that stay put without feeling constricting. Better underwear, less complaining about said underwear.

Shop Now

Two Fabric Choices

18-Hour Jersey & AIRKNITx

Better underwear is softer with just the right amount of freedom and support. We engineered our own fabric and spent over 10,000 hours to make sure our underwear is more comfortable for you.

18-Hour Jersey is the softest underwear you’ve ever worn.
AIRKNITx is lightweight, breathable, and keeps you fresh all day long.

The Difference Is In The Details

We strive to be as close to perfect as possible

  • Fabric Innovation

    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. We developed three signature blends—our 18-Hour Jersey, AIRKNITx, and Silver fabrics....

  • Smart Design

    Smart Design

    Consistent underwear fit and quality has become a game of roulette. So we decided to take matters into our own hands. We obsessed over every stitch and seam until we’d reached our definition of perfect. Every detail matters to our customers.

  • Ethical Manufacturing

    Ethical Manufacturing

    Mack Weldon is designed in the heart of NYC with our warehouse and fulfillment center in Massachusetts. Our product is sourced and manufactured in WRAP-certified factories across the globe, including in the U.S., South America, and Asia.

The Difference Is In The Details

We strive to be as close to perfect as possible

  • Fabric Innovation

    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. We developed three signature blends—our 18-Hour Jersey, AIRKNITx, and Silver fabrics.

  • Smart Design

    Smart Design

    Consistent underwear fit and quality has become a game of roulette. So we decided to take matters into our own hands. We obsessed over every stitch and seam until we’d reached our definition of perfect. Every detail matters to our customers.

  • Ethical Manufacturing

    Ethical Manufacturing

    Mack Weldon is designed in the heart of NYC with our warehouse and fulfillment center in Massachusetts. Our product is sourced and manufactured in WRAP-certified factories across the globe, including in the U.S., South America, and Asia.