HONGi is the first individualized mattress, which consists of three modular layers, each of which can be either soft, elastic or firm. The HONGi Configurator combines the layers perfectly for each customer based on his body criteria and sleeping habits. The layers are not interconnected to each other, which enables to exchange them even after the purchase and change the qualities of the mattress. The customer tests the mattress and can exchange a layer in case he is not satisfied with the layers combination suggested by the configurator. The configurator saves the customer data in order to improve his algorithm and give better advice. Can be transformed into a smart mattress via special additional IoT modules.