Mattress, semi-double, super comfortable, antibacterial, odor resistant, dust mite resistant, hotel premium, bonnell coil, hardness: firm Conditions for a mattress that will give you a good night's sleep 1. Falling asleep easily 2. Ease of turning over in bed (people turn over unconsciously 20 to 30 times while sleeping) 3. Comfortable sleeping (eliminates unnecessary tossing and turning due to discomfort) In pursuit of these goals, we designed the urethane and coils from scratch. The "Good Sleep Mattress" is created by layering the mattresses in a well-balanced way.