Midweight 2-Layer Thermal fabrication featuring a 25% Merino Wool blend outer layer and a soft 100% Cotton inner layer for comfortable warmth...more info

Duofold's heavyweight, patented 2-Layer Channel Rib Knit of Polypropylene inside, Wool and Polyester blend outside, provides advanced warmth...more info

Smartwool's heaviest line, Midweight, is perfect for forays into alpine environments where temperatures -- and schedules -- fluctuate. Comfortable...more info

Covered elastic waistband. Flatlock seam construction eliminates chafing. Traditional fly design. Active fit....more info

ThermasilkÔ Construction Silk is the only natural fiber in the world that can go from a raw state into a finished garment without processing....more info

Weather Rating: ALL SEASON The return of a classic - from Urban to Rural...the original Woodland camo pattern in thermal. Original waffle thermal...more info

Duofold's two layer 360 degree stretch thermal knit fabric. Provides optimum fit for maximum warmth and excellent moisture management in extreme cold....more info

Heavyweight 2 layer fabric traps air to create thermal barrier. Soft cotton inner, Merino Wool blend outer. Body sized for performance fit....more info

Patented heavyweight two-layer channel rib knit fabric. Wool blend outer layer insulates for maximum warmth. Patented channel rib knit moves...more info