—Nicole KinningSaatva Memory Foam Hybrid for $1,999: The Saatva Memory Foam Hybrid is marketed as firm, and that's exactly what you should expect. Despite incorporating a triple-phase LuxeCool system and cooling gel-infused memory foam, the cooling effect didn't stand out. Wayfair 10.5-Inch Plush Cooling Gel Mattress for $334: This cooling gel hybrid mattress comprises five layers of various memory foams. Wayfair Sleep 13.5-Inch Medium Cooling Gel Memory Foam Mattress for $340: This 13.5-inch cooling gel memory foam mattress is listed as medium, but I’d definitely consider it super-plush. AccordionItemContainerButton LargeChevron We have tested over 100 beds across all of our guides, like Best Organic Mattresses, Best Mattresses for Back Pain, and Best Mattresses You Can Buy Online, as well as for individual review.