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Soft Mattresses: Honest UK Comparison

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A soft mattress suits you chiefly if you're light and sleep on your side, because your shoulder and hip need room to sink before the surface supports your weight. Few others need that much give. Under a heavier body, or when you sleep face down, your pelvis sinks below your ribs and leaves your lower back arched.

Soft is a feel, not an upgrade, whatever the luxury price suggests. If you're considering soft because your back hurts, the review of 39 articles by Caggiari and colleagues puts medium-firm closest to the evidence as a place to begin for non-specific low back pain.

Soft gives a lighter side sleeper's shoulder room to sink

A yielding top lets your shoulder settle when your weight barely compresses a firmer surface. On your side, you load the shoulder and hip, with the shoulder having furthest to travel. Choose enough give to keep your spine horizontal, with the side-sleeper guide for construction choices.

Side sleeping usually needs a thicker pillow than back sleeping, so pair a soft mattress with enough pillow height to fill the remaining gap beneath your head. Shoulder width and sinking depth affect that gap. If you're heavier, start with soft-medium mattresses for more resistance.

Heavier bodies and front sleeping need more resistance

Walk past soft if your weight pushes your hips too deep, or if you sleep on your front and your pelvis drops. Buying extra softness to address back pain also needs a different approach, so use the back-pain guide before choosing a tension.

Compare construction across brands because firmness labels describe each maker's own range. There is no common firmness scale between makers, according to Bed Advice UK, which also advises firmer tension as body weight increases. Comfort-layer depth changes the feel, so give pressure relief more weight in the BedBoy Score when choosing soft for side sleeping.

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