Crepe Rubber Sheet, Natural, 12" x 18" x 6mm thick ! ENORMOUS 12" x 18" x 6mm! This Crepe laced rubber for durable shoe or moccasin soles. Heavy 6mm thickness adds spring to your step! Natural color and material looks great on any shoe. Please note, the photograph shows both the 3mm and 6mm sheets. This is the 6mm, which is very firm.