What is the best extra firm mattress?

Best overall extra-firm mattress: Plank Firm Luxe. It’s a strong first pick if you want a very firm, flat, supportive feel, and its flippable design is intended to give you two firmness options: a firm side and an extra-firm side.

Other strong picks:

• Saatva Classic in Firm if you want a more traditional innerspring/luxury-hotel feel.
• Titan Plus if you’re a heavier sleeper and want a sturdier mattress built for stronger support.
• WinkBed Plus if you want robust support but with a little more cushioning than a very flat, ultra-firm mattress.

One caveat: “extra firm” isn’t standardized across brands, so one company’s firm can feel much softer or harder than another’s. Product specs and available firmness options can also change, so check the brand’s current listing and trial/return policy before buying. If you sleep on your side or have shoulder/hip pain, an ultra-firm mattress can feel too hard unless you add a topper or choose a firm-but-cushioned hybrid.