What Our Gearhead® Experts Are Saying: "I use these as my cold-weather baselayer anytime I’m moving but still need real warmth. They’re light, stretchy, and breathe well enough that I don’t overheat once I get going. I especially appreciate how smoothly they layer under shells without bunching or rubbing."When cold air settles in and staying warm from the ground up matters, the Capilene Thermal Weight Bottoms become an essential part of our layering system. Patagonia built these baselayer bottoms for days spent hiking, traveling, or stacking layers for winter sports, where consistent warmth and freedom of movement make all the difference. Polartec Power Grid fabric creates lofted warmth while actively managing moisture, keeping heat close without trapping sweat during movement. The open-grid pattern improves breathability, while stretch construction, a gusseted crotch, and flatlock seams allow unrestricted motion and reduce chafing. A soft, low-profile waistband sits comfortably under outer layers, making these bottoms easy to wear all day in cold conditions.