The hat will fit most adult heads (head circumference 54-59cm / 21in 23.5in). You will need: yarn (up 150 grams), knitting needles to obtain the gauge (please make a gauge swatch!), darning needle to weave in the yarn ends and to sew the back of the hat. The hat is knit flat. This pattern's gauge is 18-19 stitches in 4in/10cm in stockinette stitch - please check your yarn label for needle size suggestion and make a gauge swatch! You do not need previous experience with entrelac knitting - it is explained step by step in the pattern!