When running in cold weather, wearing a fleece or thermal hat helps prevent heat loss, keeping you warm and comfortable. Here are some great winter running hats for men:

Photo courtesy of PriceGrabberThis sleek, breathable running hat is lightweight and easy to tuck into your pocket when you don't need it. Yet, when you're wearing it, it keeps your head and ears very warm. It also feature reflective elements for low-light visibility.

Photo courtesy of PriceGrabberThis unisex fleece beanie from North Face has an elasticized headband, so it stays on and keeps your ears covered and warm.

Photo courtesy of PriceGrabberThis winter running hat from Mizuno features an amazing new technology that actually generates heat from the absorption of moisture. Heat is generated via a chemical exchange between perspiration and the properties of the Breath Thermo fabric. The hat also has anti-bacterial and deodorizing functions, so it won't get smelly from sweat. It's one-size-fits-all, so it works for both men and women.

Photo courtesy of PriceGrabberThis winter running hat from Asics is an ideal training hat for inclement conditions. It features a water-resistant coating and soft fleece liner for comfort and protection. The integrated fleece ear flaps provide protection against the elements.