The heating system allows you to adjust the temperature by heating the down inside. Water-repellent fabric is stain resistant and repels water drops. Comes with a storage bag.Convenient to carry and store. Uses high quality down with a high resilience of 850 flp. Heating System Product Features: Inner downwear that can be adjusted via the power temperature adjustment switch on the chest.The heating system works by connecting a rechargeable battery to the USB plug of this product.The operating time of the heating system may vary depending on the capacity of the rechargeable battery and the temperature settings.Requires a rechargeable battery (sold separately).(USB output port: output voltage 5V output current 2A or higher)