1、POLYESTER MATERIAL: This heated sleeping bag liner is made of premium polyester material, lightweight, abrasion resistant, not easy to deform, with good durability. 2、MULTIFUNCTIONAL: It is multi functional and can be used as a sleeping bag liner or seat pad, suitable for outdoor activities such as camping or hiking, meeting the needs of different use scenarios. 3、HEATING COMPONENT: Built in heating component, it can be heated up quickly and provide you enough warmth when used in cold weather, so that you can feel comfortable and warm during outdoor activities. 4、COMPACT DESIGN: This heated sleeping bag liner features a compact design, making it easy to carry and store while saving space for on the go or outdoor activities. 5、COMFORTABLE EXPERIENCE: You can use this liner wherever you are, providing warmth and comfort in a variety of outdoor environments, adding comfort to your outdoor activities.