The straw spring coils are connected to one another with spiral wires. We use a specially treated straw spring system that eliminates the risk of sagging in areas where body weight is concentrated. By using 1000 g/m² firm felt in our mattress, we’ve provided support for your lower back and spine while also extending the mattress’s lifespan. The woven fabric we’ve used in our mattress ensures a softer, more luxurious sleep experience.