Clay has a number of appealing and unique qualities. It consists of 50% oxygen and between 20% and 40% of silicon. This mineral imparts unique heat- and moisture-regulating qualities to clay plaster. Clay is anti-static and anti-fungal. It is warm in winter and cool in summer and, hence, creates a healthy, balanced, indoor climate. Tierrafino has six different clay products in soft, natural colours for indoors and out.