First of all, there are style reasons. The sleeve lengths of European version, American version and Asian version are different. Among the clothes with the same bust, American and Canadian products such as Archaeopteryx are the fattest (Patagonia is an exception), while European mammoths and matchsticks have longer sleeves. Generally speaking, they are older and stronger (fatter), while Europeans have thinner stems. The Asian version is generally smaller.

The second is the design reason. If the selected coat model is inclined to be used for mountaineering, the sleeves will be longer than other models, because it is necessary to ensure the freedom of movement when lifting the arms and keep the cuffs stuffed with gloves to avoid air leakage. Finally, it's about your figure. Different brands have different versions, so you can choose the one that suits you best.