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Say goodbye to one-size-fits-all and hello to the California King BEDGEAR M3 Performance® Split Comfort Mattress - Firm & Soft! Taking Performance® and innovation to the next level, the M3 is the world’s first dual-sided modular mattress that empowers you to choose your individual comfort level. Featuring our Air-X® breathable mesh panels for 100% airflow and our instant cooling Ver-Tex® top cover, the M3 is the best mattress for hot sleepers.