king mattresses on sale

Standard U.S. king mattresses are typically 76 inches wide by 80 inches long. Thickness commonly ranges from about 10 inches up to 14 inches depending on the model and layer construction.

Many king mattresses combine foam and coil constructions. Common materials include memory foam and gel-infused foam, often layered over high-density foam bases. Support systems frequently use pocketed (independent) or encapsulated coils, and some designs use multiple foam layers for zoned support.

Trial periods and warranties vary by model and seller. Trial periods are often advertised around 180 nights, while limited warranties in listings can range from short guarantees (around 30 days) up to multi-year coverage (as long as about 10 years). Check each product’s terms for exact coverage and any required registration.

King mattresses are generally compatible with platform beds, slatted foundations (check the manufacturer’s recommended slat spacing), traditional box springs, and many models are also listed as compatible with adjustable bases. Always verify the product’s compatibility notes for any slat or base restrictions.

Many king mattresses advertise reinforced or enhanced edge support for firmer perimeter stability. For motion isolation, common designs use pocketed (independent) coils combined with foam layers to reduce motion transfer and minimize disturbance between sleep partners.

Many king mattresses ship compressed and rolled in a box. Expansion times vary by model; listings commonly advise allowing 24–72 hours for the mattress to fully decompress, with some stating full size within about 48 hours. While some mattresses may be usable the same night, allow the recommended time for best performance.

Care instructions vary by model, but common guidance includes spot-cleaning or wiping the surface, vacuuming the mattress, and following any manufacturer guidance for removable covers. A few listings note dry-clean-only covers; always check the specific product care label before cleaning.