Zinus Ultima 10" Comfort Memory Foam Mattress The green tea-infused Zinus Ultima 10" Comfort Memory Foam Mattress ($174-$337) not only comes in numerous sizes but also a variety of thicknesses, too. You can choose a six-, eight-, 10-, or 12-inch thickness, depending on the support you're looking for. A lot of customers purchased the 10-inch choice and loved it. Image Source: amazon.com Zinus Ultima 10" Comfort Memory Foam Mattress $174 from amazon.com Buy Now