HIMARI 日葵 is the everyday model, with a symmetrical five-layer construction and an approximate thickness of 10 cm. SORA 宙 is the 12 cm flagship, with a balanced medium feel that is slightly softer and fuller. Choose by intended use, preferred feel and available space rather than thickness alone.
Details to check before choosing
Choose HIMARI or SORA when the published dimensions fit your room and you can regularly lift, air and keep the bedding dry. Compare the firmer HIMARI with the fuller SORA by personal preference, storage space and the actual local offering. Thickness alone does not determine comfort.