How can you tell if a wig is high quality?

Excuse me, I'm in the market for a wig and I'm trying to ensure I get one that's of high quality. Could you please guide me on how to discern its quality? For instance, are there certain materials that are preferred over others? Or, are there specific features that indicate a wig's durability and realistic appearance? I've heard that hair density and cap construction play crucial roles. Could you elaborate on that? Additionally, how do I know if a wig will blend well with my natural hair color and texture? I'd appreciate any insights you could offer on this matter.