Runners who spend any time in the cold know all about having to layer and ventilate their clothing. You may be shivering at the start, but it doesn't take long for your body to warm up, and you're soon unzipping your top layer to cool off.
While jackets are filled with options to help regulate your heat, the bottom half of your body is stuck with the same layer throughout your run.
That didn't make a lot of sense to the designers at On, a Swiss running shoe and apparel company. Its aptly named Running Pants conquer the challenge of keeping your legs warm during a run while also allowing heat to escape once you get moving.
The front panels covering the legs above the knee are windproof and water-repellent to ensure they stay warm. At the knee, the panel covers a mesh vent that allows heat to escape while you're striding. But when standing still after a run, they close.
The pants have a looser fit than traditional running tights, but the lightweight polyester blend is flexible enough to feel very comfortable while running. For added ventilation, you can open the ankle zipper to reveal a mesh lining that keeps your skin from being directly exposed to the air.
The pants are pure function, and they look that way. They may be a bit pricey ($170), but regular winter runners will be happy they splurged.