The cap is made from 20% stretch knit. Use fabric with the highest cotton content as possible, such as 95% cotton and 5% spandex/lycra. Avoid polyester blends as they do not breathe and can lead to hot heads. The scarf is cut from woven. You may use a purchased scarf instead if desired. Sasha is a quick sew, make several over a weekend. You could make one or two hats with several different scarves to vary the look. The size range is 20", 21", 22", 23" and 24" head circumference.