These 100 weight fleece hoods are about half the thickness of our Regular Hoods and so, not quite as warm. The best part about them is that they are still warm and best used for under a hat or helmet when you don't have room for the thicker, warmer hood. They are made from 100% Polar Fleece (polyester) and very warm and this is a wicking fabric also. Another Warmstuff Product to help you get through the winter.