Lumbar, calves, full back — which heat zones are worth paying for.
In short
This is a placeholder buyer guide. Replace the body of this post with your full editorial content — the layout, related-Amazon block, and JSON-LD article schema are already wired up by the theme.
Key takeaways
- Decision-grade framing — what to actually pick.
- Body-size and room-size fit notes.
- Transparent affiliate disclosure.