Short answer: The central head cradle supports the neck's natural curve, helping keep the nose roughly aligned with the center of the chest for a neutral spine position.
Why back sleepers are rated "good fit," one notch below side sleepers
This distinction — good fit versus best fit — reflects a genuinely honest, graded assessment rather than treating every non-stomach position identically.
Why "roughly aligned," not "perfectly aligned," is the careful phrasing used
This qualifier acknowledges individual variation in neck length and shoulder width, rather than promising one universal, exact outcome for every back sleeper.
💡 Worth knowing: lying in your primary sleep position, your nose should roughly align with the center of your chest — the same self-check test applies here.
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