Saatva Memory Foam Hybrid for $1,799: The Saatva Memory Foam Hybrid is marketed as firm, and is designed to support your lower back with cushioning in the center. Purple Restore Cool Touch for $2,700: WIRED contributor Nicole Kinning says this is the absolute best cooling mattress by a long shot. Wolf 12-Inch Memory Foam Hybrid Medium Firm Mattress for $749: WIRED reviewer Molly Higgins found herself surprisingly impressed with this affordable mattress. My right side's muscle pain was worse after nights on this mattress, and my damaged spine felt distinctly unhappy. During my testing, I was impressed to find that a firmer mattress really did lead to big improvements in my back pain.