This jacket is made up of Lambskin Leather that is very soft and thin , it is not hard and not thick. This item is of superior quality and made of 100% genuine lambskin leather. Lambskin leather is the soft, thin, most supple skin. Size chart is attached for your reference . Size chart is prepared as per the standard measurements. When selecting a size, please leave at least 3-4 inches from body measurement to get a slim fit. For example, if the chest circumference is 38 inches, please select a jacket with chest of 42 inches to get slim fit. e.g ( 38 + 4 ) = 42 inches.