Appropriate attire for running in 20-degree Fahrenheit weather (-6.7 degrees Celsius) is crucial for both performance and safety. This involves layering clothing to trap warm air while wicking away moisture, protecting extremities from cold, and ensuring visibility in potentially low-light conditions. For example, a runner might wear a moisture-wicking base layer, a fleece or insulated jacket, windproof outer layers, a hat, gloves, and thick socks.
Maintaining a comfortable body temperature during cold-weather runs prevents hypothermia and other cold-related injuries. Proper clothing choices can also improve athletic performance by allowing for a greater range of motion and preventing overheating from excessive sweating. Historically, runners have adapted to cold weather with wool and other natural fibers, but advancements in synthetic fabrics have revolutionized cold-weather running gear, providing superior insulation and moisture management.