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Sierra Whiskey Co.

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Built for Battle. Trusted by the Elite.
Undertac: Precision-Engineered Tactical Underwear by Sierra Whiskey Co.

Forged in one of the most challenging environments on earth.

Our Undertac Infantry was crafted for men who embody resilience and precision. Tested by a 12-man team of elite Green Berets – members of the Special Forces Operational Detachment Alpha (SFOD-A) – Undertac underwent rigorous trials in one of the most unforgiving climates on the planet: the heart of Africa. From sunrise to sundown, through harsh sands and relentless heat, our gear withstood the test of the toughest operators. If it’s up to their standards, it’s built to exceed yours. Experience the best in tactical underwear with Undertac.
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