Tufts of soft, woolly roving are knit right into this ultra-warm and cozy hat with instructions given for two sizes: Child/Adult Small and Adult Medium. The tufts - also known as “thrums” - produce a fluffy inside layer that holds in body heat by catching body warmth in the small air pockets on the thrummed lining. These thrums are held into place by the simple fact that natural, unprocessed wool fibers have surface scales which love to cling to each other. This instructable shows you how to make and place thrums in your knitting projects.

The exterior of the hat has a pattern of spots which are the back side of the thrums. You can choose to match your thrums to your yarn color, or have fun with with the different colors of wool roving available and mix in more colors.

Instructions are given for the making and knitting of thrums.