Description: Easy to remove, this self-warming neck scarf features a beautiful invisible zip design for easy removal and great looks. Soft and cosy plush fabric, smooth and warm, and direct skin contact. No need to recharge this heated neck collar, it heats up automatically and is built to last. Convenient and easy to use; The neck heating ring has a dual function to keep you warm in winter and cool your neck in summer. It is constructed of flannel pcm material. The heating neck collar is 11cm in inner diameter. Suitable for any indoor and outdoor activity, such as hiking, fishing, driving, running, etc. Also suitable for keeping warm indoors. Item Name: Neck Heating Wrap Material: Flannel, PCM Features: Durable, Easy to Use, Comfortable, No Charging Required Inner Material: PCM Constant Temperature: about 48 Degrees Centigrade Size Details: Inner Diameter: 11cm/4.33" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. How to use: If the interior becomes solid, you can heat warm water at 60-80 degrees Celsius for about 3-10 minutes to make him melt completely before wearing and using, pure liquid as well as solid-liquid mixture state, it will keep a constant temperature of about 48 degrees and keep warm for 1-2 hours. Package Includes: 1 x Neck Heating Wrap