> ## Documentation Index > Fetch the complete documentation index at: https://docs.aftersell.com/llms.txt > Use this file to discover all available pages before exploring further. # Understanding Out of Stock Variants > This article explains how Aftersell handles out-of-stock variants for upsell products on the post purchase page # **Overview** Upsell products may have one or multiple variant options (such as size or color). Aftersell handles out-of-stock variants differently depending on how many options a product has, to ensure a smooth customer experience and prevent unavailable selections. *** # **Out of Stock Variant Logic** ### **Products with a Single Variant Option** If a product has **only one variant option** and that variant is **out of stock**, it is **hidden entirely.** For example, * The blue variant for this Notebook product is out of stock Image * Therefore, on the post purchase page, the blue variant will not show up as an option Image This prevents customers from interacting with a product that cannot be fulfilled. *** ### **Products with Multiple Variant Options** If a product has multiple variant options, **all variant options are displayed**, including those that are out of stock. By default, Aftersell will **preselect an in-stock variant**, if one is available. However, if a customer manually selects an **out-of-stock variant**, it will be clearly marked as **unavailable** and cannot be added. For example, * The blue/small variant for this T-shirt product is out of stock Image * However, the variant will still appear on the live post-purchase page, but customers will not be able to purchase it if selected. Image This approach gives customers full visibility into available options while preventing invalid selections. **NOTE:** This logic applies even if all variant settings are unchecked in the editor.