Phase 4 Base Layer Antimicrobial Shirt

Advanced Performance, Built for Endurance

Ideal for Tactical Training, Outdoor Adventure, Hunting, and Cold-Weather Operations

The Phase 4 Base Layer Zip Mock Shirt delivers elite-level comfort and performance for those who train, work, or operate in demanding environments. Crafted from an 87% Acclimate Dry Polyester / 13% Spandex Lycra blend, this mid-weight layer provides superior moisture management, flexibility, and durability. The brushed interior fleece traps warmth while maintaining breathability, making it ideal as a stand-alone top in cool weather or a mid-layer in cold conditions.

Engineered with XGO’s Quattro Fleece technology, the Phase 4 offers 4-way stretch for unrestricted movement and all-day comfort. Integrated Ag47® Silver Anti-Microbial Protection resists odor and bacteria, ensuring lasting freshness during extended wear. Flat seams prevent chafing under gear, and a longer torso design keeps the shirt securely tucked during intense activity. Trusted by U.S. military personnel, the Phase 4 meets U.S. Military wicking retention standards of 90% after 50 washings—a testament to its durability and performance.

Whether you’re on a ruck, a hunt, or a mission in the field, the Phase 4 Base Layer keeps you warm, dry, and focused.

Content: 87% Acclimate Dry Polyester (Brushed) / 13% Spandex Lycra
Proudly Made in the USA