The Casper Select is a Costco-exclusive 12-inch all-foam mattress featuring four layers of premium foam construction designed for optimal comfort and support. The mattress includes a 1.5-inch breathable open-cell poly foam top layer, 1.5 inches of gel-infused memory foam for pressure relief, 1.5 inches of transitional poly foam for zoned support, and a 7.5-inch high-density support foam base for durability and stability.

The mattress offers a medium-firm feel rated at 6.5 out of 10 firmness, providing balanced support suitable for most sleeping positions. It features excellent edge support for sitting and lying, with minimal sinkage depth of 1.63 inches. The hand-sewn cover combines polyester, cotton, rayon, and lycra in a thin, breathable construction with zipper removal for easy cleaning.

All foam materials are CertiPUR-US certified, manufactured without ozone-depleting chemicals and with low VOC emissions for safer indoor air quality. The king size mattress weighs approximately 85 pounds and ships compressed in a convenient compact box. The product is backed by a 10-year limited warranty and qualifies for Costco's generous return policy.