The Sealy Posturepedic Plus Mount Auburn is a 13-inch medium-firm king mattress exclusively available at Costco. This coil mattress features a quilted pillow top cover with cool-to-touch fibers and Surface-Guard technology for protection against spills and allergens.

The mattress construction includes multiple layers for optimal comfort and support: a 2-inch pillow top, 2 inches of poly foam with gel foam in the center third for temperature regulation, 8 inches of individually encased perforated pocketed coils for airflow and zoned support directly under your back, and 1 inch of support foam base. The DuraFlex Edge System provides reinforced edges for a more usable sleep surface and better sitting support.

With a firmness rating of 6 out of 10, this mattress offers a medium-firm feel, the most popular firmness level. The individually wrapped coils provide excellent support while minimizing motion transfer. The mattress weighs 97 pounds and includes a 10-year warranty backed by Costco's generous 365-night return policy.