We reinvented thermal long underwear—with our WARMKNIT fabric made of insulating Thermolite® technology and a micro-waffle knit for lightweight warmth.

Mack Weldon is reinventing men’s basics. We believe in smart design, premium fabrics, and simple shopping.

Mack Weldon

Warmknit Long Underwear

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Men's Underwear

Powered by Thermolite® technology, our lightweight WARMKNIT flannel is engineered to trap heat, but release moisture—so you’ll stay warm and dry all weekend.

Warmknit Flannel Shirt

Men's Flannels

With insulating WARMKNIT technology, hidden functionality, and a modern look, this is the fleece vest you’ll actually want to wear.

Warmknit Fleece Vest

Men's Vests

Our soft, signature 18-Hour Jersey fabric—in a stretch rib knit that won't lose its shape under your shirt.

18-hour Jersey Rib Tank Bright White

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This innovative rugby shirt keeps it casual—while keeping you comfortable and dry with wicking TransDRY® technology.

Dryknit Rugby

Men's Polos

Winter wear doesn’t get more luxe than cashmere—until you add the performance benefits of merino to the mix.

Tech Cashmere Scarf Total Eclipse Blue

Men's Scarves

Engineered for your most comfortable weekend lounging—plus quick trips outside the house.