Phase 4 Base Layer Pants

Performance Warmth, Tactical Durability

Ideal for Rucking, Hunting, Outdoor Work, and Cold-Weather Operations

The Phase 4 Base Layer Pants are engineered for high-output performance and long-lasting comfort in demanding environments. Made from a premium 87% Acclimate Dry Polyester / 13% Spandex Lycra blend, these mid-weight fleece pants provide advanced moisture management, thermal regulation, and stretch performance for total mobility.

Featuring XGO’s Quattro Fleece technology, the Phase 4 Pants deliver 4-way stretch flexibility that moves with you—ideal for tactical training, field use, or layering under uniforms and outerwear. The brushed interior offers soft insulation while maintaining breathability, keeping your body temperature balanced during intense activity.

Integrated Ag47® Silver Anti-Microbial Protection resists odor and bacteria buildup, while flat seams prevent chafing under load-bearing gear. Tested and trusted by U.S. military personnel, the Phase 4 meets U.S. Military wicking retention standards of 90% after 50 washings, proving its durability under real-world use.

Whether you’re rucking through the cold, working long shifts outdoors, or training in the field, the Phase 4 Base Layer Pants keep you dry, warm, and mission-ready.

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