Compression tights or compression leggings are ideal for winter running or workouts outdoors.  This type of sports apparel helps keep your body temperature perfectly regulated in all weather conditions.  

Compression tights or compression leggings are designed so that it is tightest at the ankles and gradually become less constrictive as you move up towards the knees and tights.

Some Compression tights are designed specifically for a sport such as compression tights for running and cycling compression tights.   You can also use compression tights or leggings after endurance runs, cycles or exercise to boost recovery. To be effective these should be used immediate after activity so you get the desired effect.