A new study just came out indicating Autism affects 1 in 110 children and 1 in 70 boys. Help promote awareness of this condition with the Autism Awareness Puzzle Hat. A portion of the pattern's proceeds will be donated to Autism Society. The pattern is knit flat and uses Intarsia method of color work. There is a separate chart for each of the sizes. BASIC SKILLS NECESSARY Cast on Bind off Decreasing Intarsia GAUGE 18 stitches and 26 rows = 4 inches in stockinette stitch SIZING / FINISHED MEASUREMENTS Children's S (M, L, Adult) Circumference 16 (17, 18, 20)"