Smooth leather has a uniform and very fine grain surface. A combination of chrome tanned and vegetable tanned leather. Chrome tanning is the fastest process combing chromium salts, it can dye to any colour and not fade with age. Not recommended for people with chrome allergies. Vegetable tanning uses bark and leaves which develops a beautiful patina. Gentle on skin but sensitive to humidity so moisture can leave a contact colour residue that will subside. Apply water and stain protector before wearing and after each clean. For regular cleaning just use a soft dry cloth or if dampened allow leather to air-dry naturally away from direct heat.