Features: Enjoy warmth wherever you go. Perfect for chilly winters! Our warm neck collars are designed with an invisible zipper for easy removal and convenience. No need to charge, making it easy to use. Usage: The first type: immerse it in hotwater for 3 minutes.The second type: heating in a microwave oven for 20-30 seconds.(note:It will be damaged if the heating time exceeds the specified time.) Constant temperature for 2-3 hours. Whether you're engaging in winter outdoor activities or simply staying at home, our Neck Collar is the perfect companion for warmth and comfort. Experience long lasting warmth and comfort with our Heating Collar. Say goodbye to cold necks and hello to warm relaxation. Specifications: Material: HighDensity PVC Inner Diameter: Approx.12.5cm/4.92inch Color: White/ Gray Package Includes: 1x Warm Neck Collar note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.