If you're not sure about your hat size, measure the outline of your head by using a measuring tape and a mirror. Place the measuring tape on the back of your head and gently fold both sides to the centre of your forehead, approximately 2.5 centimetres above your eyebrows. Make sure to measure your head where you want to inside of your hat to sit. Read the measurements of your head in whole centimetres and if you're in between two sizes, round up to the nearest whole centimetre. If you want your headwear to cover your ears, e.g. beanies and caps, add 1 centimetre to your measurement. We recommend measuring two times to be accurate.