Sizes differ from product to product. The available sizes are shown in the size option on each product page.
How to find your size
Lay a sweater or hoodie that fits you well flat on a table. Measure the width across the chest, from armpit to armpit, and the length from the top of the shoulder to the hem. Compare these numbers with the size information of the product you want to buy.
If you are between two sizes, choose the larger one for a relaxed fit or the smaller one for a closer fit.