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Performance Collection

Breathability. Targeted support. Second-skin comfort. Meet STEALTH, by Mack Weldon.

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Stealth Boxer Brief

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Stealth 8" Boxer Brief

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Stealth Crew Neck T-Shirt

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Body Mapping Technology

Body mapping technology is based on your body’s response to physical activity. Our fabric is equipped with mesh zones for enhanced airflow, and elastic zones for added pressure—giving you breathability and support where it matters most.

  • “BEST WORKOUT UNDERWEAR. So far I have ran, hiked, and biked in these underwear and they have been awesome! They don't leave me hot and sweaty like shorts with liners or compression shorts.”

    - Jason D.

  • “HIGH QUALITY AND BEST YET. I have big quads and these are the first underwear that truly do not roll up on me under any circumstances. They are very supportive, at the same time very comfortable. So far they seem durable and have held up through several washings. Highly recommended.”

    - Eric M.

  • “PERFECT. I’ve tried so many athletic underwear brands and styles. This is superior to all of them. Comfortable, breathable and not too restricting in the waistband. Very flattering and functional.”

    - Daniel S.

Try On Guarantee

If you don’t love your first pair of underwear, we’ll send you a different size or style, or issue you a full refund—no return required.