The depth of product mix refers to the number of distinct variations a company offers for a given product type. A product depth of 12, for instance, means a given product has 12 distinct options based on such factors as size, flavor, nutrition, weight or service level.
If a particular shirt comes in three different sizes with five color options in each size, the shirt has a depth of 15 product variations. A deep product mix allows for buying flexibility based on preferences or needs of the customers. Some companies maintain a narrow product depth to stick to a few core product options.