These are a unisex Hoodie. The sizes also equivalate to Aus womens sizings. For example a size 10 = size 10 womens (Small). This pocket no zip hoodie is not a generous sizing, therefore we recommend you go up a size to what you think you may be. If ordering for a standard size child, take the age and go down one size. For example a size 8 generally fits a 10 year old etc.