Nothing causes a chill quite like the wind, and windproof pants are a necessity for cool and windy conditions. Modern fabrics allow breathability on top of windproof and even waterproof protection, ensuring your comfort even as you heat up. Softshell windproof pants are unparalleled for training in variable conditions. Elasticized materials accommodate some stretch for unbeatable freedom of movement. In extremely cold conditions, you can even layer an additional baselayer beneath a windproof shell. Windproof pants are also often lightweight, so they will not hold you back when you run, bike and hike. The North Face is one superlative brand for men's windproof pants.