As this is a natural product, the dimensions may vary slightly; however, size S/M is specifically designed to fit the shape of the shoulder and neck to prevent creases. To keep the coat fluffy, it should be regularly shaken out, aired (ideally in damp, misty weather), and brushed. Because the coat is untreated, its natural lanolin gives it self-cleaning properties; frequent washing and drying in the sun or on a radiator are not recommended.