We make these boot-length bottoms for taking the line less traveled. With the micro-grid fleece interior of our Capilene Thermal Weight, they provide the greatest warmth combined with the greatest breathability of any baselayer in our lineup. Soft, stretchy and compressible, the Polartec Power Gridfabric has a smooth face that glides beneath layers and a brushed fleece interior to warm your core, wick moisture and feel smooth against your skin. Capilene Thermal Weight is bluesign approved, has 92% recycled content and is treated with Polygiene permanent odor control. Features include a flat waistband with brushed inner elastic for next-to-skin softness, a gusseted crotch for mobility, flatlock seams to minimize chafing, and a 22-inch inseam for comfort with big boots.