Patagonia's warmest, most breathable Capilene baselayer is made with low-bulk Polartec Power Grid fabric with Polygiene permanent odor control and is Fair Trade Certified for sewing. The weather patterns on Mount Dickey almost always make a mess of your plans. Think you'll spend the night in a tent? Think again. Be ready for anything with these warm, efficient bottoms. Equally at home during high-exertion alpine routes or freezing nights in a sleeping bag, the micro-grid fleece interior of Patagonia's Capilene Thermal Weight provides the greatest warmth combined with the greatest breathability of any baselayer in our lineup. Soft, stretchy and compressible, Polartec Power Grid fabric 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. This fabric also has 30-92% recycled content and is treated with Polygiene permanent odor control. Features include a brushed elastic waistband for next-to-skin softness, gusseted crotch for mobility, functional fly and flatlock seams that minimize chafing.