Best king size mattresses

Start with the Saatva Classic. It's the safest king for most people: a coil-on-coil innerspring with three firmness choices (Plush Soft, Luxury Firm, Firm), so you can match it to how you sleep, and it has the strongest owner ratings of the group.

Who the others suit:

• Helix Midnight Luxe — couples who want a medium-firm hybrid with pressure relief and a bit of bounce.
• Brooklyn Bedding Aurora Luxe — sleepers who run hot; three firmness levels and a cooling cover.
• Nolah Evolution — side sleepers wanting a plusher, more cushioned hybrid.
• Titan Plus Luxe — heavier sleepers or anyone who wants a firm, supportive hybrid.
• Twilight Hybrid — budget-minded shoppers who still want coils and a pillowtop feel.
• Green Tea & Charcoal gel foam — a cheap, simple medium-foam option for a guest room.
• Saatva Rx — people with aches who want a softer, pressure-relieving build.

Check the size on each card: a few listings are queen or California king, so confirm you're getting a true king.