Winter hat stylish and extra effective. This winter hat has a 3M Thinsulate 40 gram Thermal Lining which is great for keeping your ears ans head toasty warm! This isn't just a super soft layer added to the hat, it has special abilities that allow it to retain your natural body heat, while also allowing the cold ans moisture to escape - leaving only the warmth inside the hat close to your head. This hat is also thin, but still warm. This makes for an extra comfortable fit while wearing. The thin material means it sits easier on the head and isn't chunky when being worn.