Pearl Izumi's Select Thermal Barrier Pants keep your legs warm on cold days. The articulated knees allow for excellent freedom of movement. Select Barrier fabric provides the perfect insulation for a wide range of temperatures, protects you from the wind, and resists water penetration. And, Elite Thermal Fleece fabric provides exceptional warmth and moisture transfer. Top it off with 8-inch ankle zips, a zippered back pocket, and reflective elements.