This listing is for a complete three piece system, in size Medium. The system includes one Classic Ultra Light OTC as an inner sock, one Vapor Barrier Liner for a second layer / barrier, and one Classic Medium OTC outer sock. Our 3-layer Vapor Barrier Liner (VBL) system bundle is engineered for extreme cold conditions where moisture management inside boots is critical. This system combines three key layers to create an ideal environment that protects your feet from cold and wetness: Inner Layer: A thin wool liner sock worn directly against the skin to manage moisture and provide softness. Middle Layer: The Vapor Barrier Liner, which traps beneficial moisture close to your skin, allowing your body’s sweat to regulate warmth while preventing outside water from penetrating inward. Outer Layer: A heavier wool sock that provides insulation by absorbing any moisture produced, maintaining consistent warmth and comfort. Together, these layers work in harmony to minimize condensation buildup, keep feet dry, and maximize thermal efficiency—ensuring your feet stay warm and protected during the harshest conditions.Made in USA For government sales inquiries for Winter 2025/2026, please contact us at [email protected].
