Mattress only - Made in Japan - Highly breathable bonnell coil mattress - Semi-double Designed to be firm, to suit Japanese tastes Ideal sleep comes from a position that makes it easy to fall asleep. In Japan, where futon culture is strong, many people generally prefer firm bedding. This time we made it into a "firm" texture that is more familiar to us. In addition, it is safe for children, whose joints are softer and whose backs are weaker than adults. It is designed to be firm enough to allow you to maintain your sleeping position. Proof of safety and security: 3-year quality guarantee We conducted mattress durability tests in accordance with the Japanese Industrial Standard JIS S 1102. Place it in the center of the mattress, where your hips are the heaviest part of your body. The durability of the product is tested by repeatedly applying a load of approximately 100 kg 80,000 times. We guarantee durability so that our customers can use our products for a long time, and we offer a 3-year quality guarantee.