What are you most proud of? I really love this hat! What advice would you give someone starting this project? Thrumming is a fun technique that adds a warm fleece lining to your project by knitting wool roving into the fabric. If youve never tried thrumming before, Id like to teach you how to do in my Thrum-fun Hat color illustrated pattern. You will learn how to add thrumming to the earflaps for extra warmth and softness and the pattern also includes lessons in how to make bobbles the easy way and how to make a knitted cord.