Mattress Firmness Guide
Firmness labels are useful directionally, not as universal measurements. A “medium” from one brand may not feel identical to a “medium” from another.
Three variables matter
Your sleeping position, body weight and personal preference all affect perceived firmness. Comfort-layer thickness and material also change how much you sink before reaching firmer support.
Use labels comparatively
Firmness is most useful for comparing options within the same product line, such as Signature Bliss Medium vs Medium-Firm.