DeWitt’s 1.5 oz. N-Sulate is a medium weight, permeable, UV-treated fabric designed to protect flowering annuals, bedding plants and vegetables from the severe cold and freezing temperatures. It provides approx 6-8 degrees of protection and allows 50% light penetration. This fabric installs easily and is reusable. N-Sulate can lengthen your harvest time and extend your flowering season.