Fiber Trends design by Bev Galeskas. Novelty yarn felted in with the wool gives this hat and muff a "fur" look. Size: This hat will felt to fit most adults. Exact size is determined by the felting time and with blocking. Muff measures approximately 12" long by 8" in diameter. Yarn Requirements: Hat requires approximately 345 yards of a worsted weight wool that will felt easily and 90 yards of a furry novelty yarn. Muff requires 170 yards of wool and 120 yards of the novelty. Suggested Yarns: 10 Ply Wool with Naturally Temptation.