soil -Bathmat Wave B255 W22.6&times;D16.7&times;H0.37inch This is a bath mat of a hard board made with Japanese diatomaceous earth. An absorbing water power is high and i release water in the air naturally and dry. Drying is early and suppresses the outbreak of a tick and the mold. The everyday washing is not necessary. I only air around one time for one month. Made in Japan