The Serenade mattress has 4 layers: 2 inches of GOLS Organic Latex top layer, 2 inches of Coir, 2 Inches of GOLS Organic Latex and 2 inches of Coir for a total of 8 inches. This mattress can be covered in 100% natural Bamboo or GOTS certified organic cotton. This combination provides a medium firm, consistent body support combined with excellent air circulation. This keeps the mattress free of heat and moisture. This mattress can be flipped to either side however, the latex side is medium firm and the coir side is much firmer. Firmness level: 6 – 7