16 Tips for User-friendly Faceted Navigation
Again a really impressive post. Thank you for showing all these examples.
1. Use Relevant The Outdoor Option​
2. Position Facets Horizontally or Vertically
3. Present Facets for Maximum User-Friendliness
4. Use Facet Images 
5. Include Customer Reviews as a Facet
6. Display Store- or Industry-specific Facets
7. Use Collapsible or Expandable Menus
8. Clarity of choices
9. Organize Values Within the Facet