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.
Details to check before choosing
Measure the usable length and width of the floor, platform or bed base, including any raised edges. Compare those measurements with the exact model and size offered for your country. Then check the folded size and weight, and choose a sheet or cover that fits the same dimensions.
After sleep, lift or stand the shikibuton so you can inspect its underside and the supporting surface. Let both release moisture. Air both faces in a ventilated place, turn the bedding over and rotate it head to foot regularly. Fold and store it only when it is dry.
Sources for this answer
A lower bed without rearranging the whole bedroom
If you want a lower sleeping arrangement in your Greek home while keeping existing furniture, measure the full area around the bed. HIMARI is 210 cm long and SORA 200 cm. A platform enclosed by raised edges needs an internal measurement, and the remaining walkway matters as much as the mattress footprint. Extra length is useful only when the support and surrounding space can accommodate it.
HIMARI's steadier medium-firm feel and SORA's fuller cushioning may suit different preferences. Neither thickness nor a Japanese origin guarantees personal comfort. Both fold into thirds, but leaving enough room to lift and air the bedding is still necessary when the bed usually stays made. For occasional storage, compare the folded dimensions and weight with your chosen space. A low bed can be a considered preference, provided checking the underside and drying the support remain practical parts of everyday use.
How do I choose between HIMARI 日葵 and SORA 宙? · How do Japanese shikibuton sizes compare with local bed sizes?