Google is testing even more detailed search refinements in the core web search results. I personally cannot replicate it by the folks at Glass Digital posted on Twitter examples of the refinement options at the bottom of the search results for queries including [garden furniture] and others.

Here are screen shots of Google showing refinements by material, razor type, brand, general type and more:

Can you replicate this?

Here is a video of it in action:

Forum discussion at Twitter.