Running in cold weather is not hard, especially after you run for a few minutes to warm up. The main problem is avoiding slipping on the ice, but that can be avoided by using hex head screws on the bottom of the shoe. Running in the heat is a different matter. I hated running in the heat! But if you are so interested in the topic of running , you can read a lot of useful information on innovativerunners. Here you will find dozens of useful articles about the sport of running.