Made with three 3-inch layers of natural latex, the Organic Serenity Natural Latex Mattress measures 10" high with a quilted casing, with 98% Natural Dunlop and Talalay latex. Hypoallergenic comfort for allergy sensitive sleepers, with no formaldehyde, TDI (toluene di-isocyanate), styrene, butadiene, and other petroleum derivatives (though if you have a latex allergy, no such luck), and rated to last 30 years or more. As other memory foam mattress, natural or otherwise, these should keep you a lot warmer during these cooler months, so people who get cold easy might benefit switching over to a latex mattress in overall slumber comfort. We especially like the 90 day firmness guarantee (especially after our W Hotel mattress lost its shape in about that time). More information about the Serenity Natural Latex mattress here at Denizen Design Gallery.