The three versions of headers available in Hyvä UI are:

1. Clean
2. Compact
3. Stacked

1) Clean: This header prioritizes a simple and uncluttered design that keeps the focus on the store’s logo and navigation menu. It can collapse and expand to show additional elements like the search bar.

2) Compact: The compact header is designed to save space by hiding some elements until they are needed (like menus and search bar). This can be useful for websites with a lot of content above the fold or for mobile devices where screen space is limited.

3) Stacked: The Stacked header includes lots of elements in a limited horizontal space like a large search bar, navigation menu, benefits, and other elements.