... Electronic warm shoe is a kind of new healthy and warm shoes .It keeps warm ,dry ,remore the smell ... button to increase the temperature and keep warm .You can recharge the shoes for 4-5 hours before ... .4) Besides the increasing temperatures fuction ,the shoes always can keep dry ,kill bacteria,remore the smell ... Anyway,it's a new type,good health and warm electronic shoes ,have it ,you won't have cool ...