Here's what other sites are saying:
The Silver Bullet Wind pants from Brooks take the bite out of cold, windy weather thanks to a specialized fabric with a heat-boosting aluminum membrane. Polyester fabric cuts through wind and sheds light moisture; moisture-wicking lining improves fit and feels soft against skin. Aluminum membrane retains heat without increasing weight of garment, and stretch-knit panels with articulated knees maximize movement. Reflective highlights increase visibility from any angle. Offset ankle zippers make it easy to put on pants without removing shoes. The Brook Silver Bullet Wind pants offer a next-to-body fit.