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Firmness should match your sleeping position and body weight, not personal preference alone: side sleepers generally need a softer surface (soft to medium) to cushion the shoulders and hips, back sleepers do best on medium to medium-firm, and front sleepers usually need firm support to stop the hips sinking.

Heavier body weights need a firmer mattress than the general guide suggests, since more weight compresses the same material further. The opposite is true for lighter sleepers.

If in doubt, medium-firm is the safest middle ground for most UK households, and every Hartley Dreams mattress carries a 12-month to 5-year guarantee depending on the model, so you're covered while you settle in.