The Casper Cooling Select Hybrid is an 11.75-inch hybrid mattress exclusively available at Costco, designed to deliver a medium-firm feel with advanced cooling and spinal support. It features four layers of premium foam over a pocketed coil support base, measuring 72 inches wide by 84 inches long and weighing approximately 102 pounds. The mattress ships compressed in a box and is assembled in the USA. All foams are CertiPUR-US certified, and the construction is fiberglass-free.

The comfort system includes 1.5 inches of poly foam, 1.5 inches of memory foam, and 1.5 inches of zoned poly foam for targeted spinal alignment, sitting atop 5.75 inches of individually wrapped pocketed coils and a 1.5-inch high-density base foam. The pocketed coil layer promotes airflow and minimizes motion transfer — measured at 27% less than average — making it well-suited for couples. Material response is exceptionally fast, recovering in approximately 0.4 seconds, giving a "floating on top" feel rather than a deep sink. Maximum surface temperature measures 1.8°F cooler than average, with a breathable knit cover featuring reinforced side panels.

The mattress carries a 10-year limited warranty and is backed by Costco's satisfaction guarantee, which effectively provides a 365-night in-home trial.