In the lineup of Lifekind organic mattresses, the Duet can be something of an enigma. It's made from three internal layers of natural rubber, which would normally lend itself to softness, but the top and bottom layers are made from the firmest natural rubber we use – plus it's got a closed cover, which makes for a firmer mattress. Then again, the center layer is made of the softest natural rubber, and the firm top and bottom layers are sculpted into contoured ridges, which makes them softer. Euro, which is the firmest mattress we make. The Duet is designed to offer uncompromising support, but also pressure-point relief via the sculpted ridges in the top and bottom layers. This can come in very handy for sleepers who need a combination of firmness (or back support and cushioning for pressure-point pain. Think of it as a medium-firm mattress that's cushiony enough even for side sleepers. To talk about the Duet or any of our other mattresses with a product specialist, give us a call at 800-284-4983 or email firstname.lastname@example.org.