You would need around 8oz of 4 yarns of wool for a medium sized scarf. Woolen scarves apart from being trendy and colourful are also very durable and useful during the cold months. It is easy to make them. Usually the amount of wool depends on the length and size of the scarf that is intended to be made but the above measurements should be quite sufficient to make a simple one without any difficulty. The colour of the wool can be of your choice. It also requires No. 10 ½ knitting needles. Cast 35 stitches with the help of the No.10 ½ needles on to your knitting needle. Then knit 35 on the 1st row and 35 on the 2nd row. These rows set the pattern in the scarf. Continue to do so until you reach the required measure of length for your scarf and then bind off.