
On your back, your neck needs thin support under the neck only. On your side, your spine needs thick support under the head, exactly as thick as your shoulder is broad. Ordinary thick, thin or memory-foam pillows can do neither correctly, because they are not made to your size. Neckfit is.
When you sleep on your back, your neck has a natural curve (called cervical lordosis). A normal mattress cannot support this curve, so your neck hangs without support all night — a major cause of neck pain and cervical spondylosis. When you know your exact neck length, Neckfit supports this curve just the right way.
Correct — while sleeping on your back, you should not keep a regular pillow under your head (or only a very thin one, about an inch). A thick pillow under the head bends the neck curve the wrong way, which is one of the main causes of neck pain and cervical spondylosis.
Nobody sleeps on their back the whole night. When you turn to your side, your spine should stay straight — and that only happens when your pillow is as thick as your shoulder is broad. Otherwise your head drops down and bends the neck. That is why many people push a hand under the pillow, fold it, or stack two pillows — which then causes hand and shoulder pain too. A pillow matched to your shoulder broadness keeps the spine naturally straight.
On your back, a thick pillow bends your neck curve in the opposite direction (lordosis becomes kyphosis) — a main cause of cervical spondylosis. And unless its thickness exactly matches your shoulder broadness, you are only guessing your size. It is like wearing shoes or spectacles without knowing your size.
A thin pillow damages your neck in both positions: on your back it lifts the head and flattens the natural neck curve, and on your side it lets the head drop down and bends the straight spine.
Memory foam has many issues, but the biggest one is simple: memory foam pillows are not made to YOUR size. A pillow that does not match your neck length and shoulder broadness cannot keep your spine in its natural shape.
Next: find your size, read the benefits and how to use a cervical pillow, or see what doctors and users say.