Dewitt thermal blanket is designed to let rain and irrigation through to your nursery stock, while holding in precious heat * DeWitt thermal blanket is a 3-ounce white, non-woven, needle-punched polypropylene material * No need to worry about foliage burn due to the fabric?s permeability, can remain in use even on sunny days * Great for late fall and early spring applications to extend your selling seasons * Dewitt thermal blanket also makes an effective alternative for over-wintering perennials and other ornamentals