- The plant antifreeze bag is made of durable, soft and breathable non-woven fabric, allowing air and a small amount of water to enter the plant, maintaining healthy growing conditions. 2 . There are four sizes available to meet your needs for different types of plants. 3. Convenient drawstring and side zipper design makes it easier and faster for us to cover plants in bad weather. 4. Thicker ground cover can provide better frost protection for plants. It will keep the air hot longer. The cover will not block sunlight. Your plants can grow normally. 5. The plant frost cover can protect your plants from snow, frost, wind and dust, and make your plants grow healthy.