<human>:  What clothing options are best for outdoor running in cold weather?
<bot>: The best clothing options for outdoor running in cold weather are layers made from sweat-wicking fabrics like polyester and spandex blend, thermal base layers, waterproof jackets, a hat or headband, and wind-resistant pants or tights. You should also consider wearing several thin layers rather than one thick layer to maintain comfort and flexibility. Make sure to wear shoes that are suited for running.