Easy to knit. Knitted back and forth and in the round. You need yarn (Hobbygarn, Viking of Norway is Bulky, 7 WPI, yarn that felts. 200 grams, 328 yards or 300 meters for women´s size and 250 grams, 410 yards or 375 meters for men´s size) and needles (6,5 mm/US 10 1/2). Two sizes, women´s and men´s.