Millennium by Sierra Sleep blends copper-infused gel memory foam, charcoal-infused comfort layers, and sculpted phase-change materials over a high-density support base to deliver balanced cooling, pressure relief, and motion isolation

Wrapped in a moisture-wicking 4-way stretch knit cover with reinforced edge support, each Millennium mattress is CertiPUR-US® certified, adjustable-base compatible, and backed by a 10-year limited warranty plus a risk-free trial and convenient nationwide delivery