BUILT FOR PEOPLE WHO WORK

At SI Workwear, we carry the toughest brands and the best lineup of work clothing in the country. From job sites to shop floors, our gear is made to handle the grind—durable, comfortable, and dependable every day. If you work hard, you need clothes that work just as hard.

GEAR THAT WORKS AS HARD AS YOU DO

When the weather turns rough and the work doesn’t stop, SI Workwear has you covered. Our outerwear is built to take a beating—crafted from rugged fabrics that resist wind, rain, and cold without slowing you down. From insulated jackets that keep you warm on the job site to water-resistant shells that stand up to the elements, every piece is designed for real-world durability and comfort. Whether you’re working in the field, in the shop, or on the road, this gear works as hard as you do.

Under Armour 3.0 BaseLayer Shirt

$70.00

UA Base 3.0 is built for very cold weather and moderate activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think long underwear, revamped for today's top athletes.

UA Base™ 3.0 All Season Baselayer provides midweight warmth at many activity levels & cold temperatures
UA Scent Control Technology to keep you undetected in all pursuits
Soft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortable
Material wicks sweat & dries really fast
4-way stretch material moves better in every direction
Fitted: Streamlined fit that’s not too tight or too loose.
Style #: 1343243
81% Polyester/19% Elastarell
Imported

Under Armour 3.0 BaseLayer Shirt

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