Design for product variants

Some products on your store might require shoppers to choose more than one product option such as color, size, material, style etc. Ensure that the combinations that are not available are not selectable. For some of these options you can pre-fill default values with the most popular variant. But, for certain options such as size, don’t use defaults as your shoppers might end up purchasing the wrong size. Leave it blank and prompt the user to enter the correct size.