Yes, our product has a gathered structure and is specially designed with a drawstring system for use. When you open the product, there is a wide mouth part. You can comfortably place the pot or container you will use for the fermentation process inside this section. After placement, you pull the strings located on the edges of the product from both sides, gathering the top part. In this way, the mouth part narrows and the container inside is wrapped better to preserve the heat. When the strings are pulled, the product closes from the top, but if a completely airtight and tight seal is desired, it is recommended to close the pot or container with its own lid and then place this product over it. This way, both the internal heat is preserved and the fermentation process is more efficient. In short; The product is drawstring and gatherable. The top part is tightened by pulling the strings. It helps to ferment by preserving the heat. It is recommended to use it with a lid for better results. Thanks to its practical use, it is both an easy and effective solution.