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Base Layers

Savings are marching in! Up to 50% off sitewide.

Women's Tactical Underwear and Base Layers

It's not just about what you wear on the outside. What's underneath matters, too! At Military 1st, we know that the right base layers make all the difference, keeping you warm, dry, and ready for anything, whether you're conquering the great outdoors or tackling a busy day. Our collection of women's tactical underwear and thermal base layers is designed for comfort and performance. Choose from breathable and cosy long bottoms, durable long-sleeved tops, and advanced thermal underwear sets from trusted brands like Alpinus that will keep you insulated without bulk. Layer up the right way. Explore our range today!