Serta's Perfect Sleeper X Max Medium 14.25" Quilted Hybrid Mattress offers the perfect balance between soft and firm; ideal for all sleep positions. It features five support zones designed for full-body spinal alignment with a combination of supportive coils and Perfect Conform Memory Foam. Sleep comfortably cool throughout the night with cooling technology and graphite-infused memory foam designed to redistribute heat away from your body. Plus, a layer of micro coils and a classic quilted feel makes for night after night of perfect sleep.