Full grain refers to the strongest and most durable part of the hide of an animal, which is just below the hair and has not been sanded, buffed or snuffed (as opposed to corrected grain) which means it displays the more natural characteristics of leather. It is regarded as the highest quality leather.

As the grain surface is left intact before applying the surface coating, the leather has more fibre strength and durability and as it ages, it will develop a patina over time. Full grain leather often comes with an aniline finish which stains or dyes the leather while still allowing the natural grain to show through, this subtle finish allows the leather to continue to breathe, as opposed to other types of leather which are sanded down and given a thicker finish coat.