Shima tofu is characterized by its firmness compared to tofu commonly found in other regions, and one characteristic of Shima tofu is that it is heavy and large, weighing between 900 grams and 1 kilogram. Okinawa has a hot, subtropical climate, so regular tofu with a high moisture content spoils quickly and does not last long, but by thoroughly removing moisture, the tofu has a better shelf life, making it suitable for Okinawa's climate.