Features:1. The toes are warm and safe without pollution.2. The skin is not irritating.3. Heating is simple and no external energy is required.Instructions:1. Unpack the outer packaging.2. After the air is exposed for 30 seconds, tear off the protective paper, stick it on the front of the sock, and wear the shoes. If the shoes have good breathability, they can be attached to the soles of the feet.3. Can be attached to the instep to warm the toes. With it, the toes will never be numb in the cold winter.4 can be attached to the ankle joint to help the blood circulation of the foot.This is a disposable product that can be heated for 8 hours at a time.