Play outside all winter long in a pair of Kari Traa Tirill Tights. Made for the Nordic winters, these pants will keep you toasty warm. Go ahead and run in the elements, the front thighs have water-repellent panels to keep you dry and warm. They are treated with Rudolf Bionic Finish® ECO, which is a sustainable, durable, fluoride-free water-repellent treatment. So not only will the pants keep you dry, they are also better for the environment than traditional water-repellent finishes. Don’t worry about overheating in these tights, either: The back is made with a breathable fabric to help regulate your body temperature as you get going. They are warm, quick-drying, and wick away moisture from your legs to keep you dry. These tights also have stretch properties and articulated knees so you can run and move the way that you want. Plus, there is an ankle zip for extra-easy on/off over shoes. Looking for other cold weather running apparel? Check out our guide on the best winter running apparel.