Product filters help shoppers narrow a listing by price, availability, sale status, vendor, brand, categories, tags, attributes, or eligible metafields.
Price, availability, sale status, vendor, brand, categories, and tags are built in. You can change their labels, turn them on or off, and arrange their order. Their behavior stays fixed.
Custom filters
Use an attribute such as Color or Size, or a product or variant metafield enabled for both storefront visibility and filtering. Product and variant metafields are listed separately, even when they have the same name.
The source determines the available display choices. Standard attributes support checkboxes or pills; swatch attributes can show colors, and image attributes can show option images. Select-list metafields offer choices, boolean metafields offer yes and no, and numeric metafields offer minimum and maximum values.
For custom choice filters, Allow multiple selections lets a shopper select more than one value. A product can match any selected value within one filter, but must match every selected filter. When filters refer to variants, one variant must match all those choices.
Counts show how many products match each choice while keeping the other filters applied. A selected choice remains available to remove even when its count is zero. Long choice lists can be searched and paged when the theme supports those controls.