Short answer: The Central Core zone is marketed for a chin rest area, a headphone/ear gap, and shape retention — three specific, practical functions.
Why "headphone/ear gap" is a genuinely specific, modern detail
This addresses a very particular, relatable use case — side sleeping while wearing headphones or earbuds — worth noting as a specific, practical design consideration.
Why this zone connects directly to the back-sleeper "good fit" rating
The central core supports the neck's natural curve, helping keep the spine in a more neutral resting position — the specific mechanism behind this zone's back-sleeper relevance.
💡 Worth knowing: shape retention is also listed under this zone — worth understanding as a durability-related claim distinct from the comfort-focused functions.
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