Ergonomic human-grade orthopedic memory foam encased in stain-resistant Belgian linen.
Winston normally avoids beds and prefers the cool floor, but he slept right through the night on this. The memory foam is firm enough that his hips don't sink through to the floorboards. Truly human-mattress quality.
The linen cover is gorgeous. It looks like an intentionally chosen floor pillow in our living room. It already survived a muddy paw incident with a quick wipe down!