iComfortPro - 13" Ambrose Latex Foam Firm MattressSerta iComfortPro, our most advanced mattress that features layers of premium latex foam in a 5 zone comfort system. The new iComfortPro features 5 support zones made from natural latex that retains its shape to promote better spinal alignment, while contouring to your body and providing even pressure relief. Why latex? Latex foam comes from rubber trees, making it naturally durable, non toxic, breathable with contouring comfort and pressure relief