This is one of the most important features if your store sells variable products, products with size and color combinations.
Without this, filtering by “Red” + “XL” shows every product that comes in Red and every product that comes in XL. But it does not check whether Red + XL exists as a real combination. Customers see results, click a product, and get “Sorry, this combination is unavailable.” Frustrating. They leave.
With variation-aware filtering, the plugin checks your actual product variations. If a product does not come in Red + XL, it will not show up in results. Customers only see products they can actually buy.
Turn it on in WooCommerce, Settings, FilterKit Pro, Features , Variation-Aware Filtering. If you have 10,000+ variations and filtering feels slow, also enable the Variation Cache in WooCommerce, Settings, FilterKit Pro, Advanced.