As one could read in the other reviews already, the sleeves are not leather but rather shiny, very thin fabric. These sleeves are clear to me too big, which is a bit strange at the material looks (I usually wear a 34). That in itself the substance in total is very thin, I find, however, not annoying and I did not feel that the jacket thus might be faster as broken. As a sweater, it is sufficient in any case. Overall, I must say the jacket is very nice despite the bit too big sleeves and I'll wear them also. (Return makes no sense anyway, because the return shipping is more expensive than the purchase price of the jacket). Even when sending I can not complain. But it comes from England, the jacket relatively quickly (less than one week) was with me.