Warmth depends on the room, floor and bedding layers. In winter, add a warmer fitted cover, a heavier kakebuton or an appropriate insulating layer. In summer, use a lighter cover or quilt and keep the room ventilated. Before using underfloor heating, check the instructions for the bedding, flooring and heating system.
If you are comparing Japanese futon care with a conventional mattress, focus on airflow, dryness, regular turning, and the right cover; these habits help the shikibuton keep its shape and comfort.
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