7buy One Pair Battery Operated Insole Heated Insoles,cut to Fit Size for Shoes Outdoor Sports Skiing,battery Not Include Battery operated heated insoles,battery not included.Need 6 Pcs AA batries. Temperature running 35-42 degree,the temperature may be affected as outside cold weather. And the insole could be cutted to your size for your shoes according you need in the cold weather. With 2 straps design to tied at the feet of achilles tendon.And you could place the battery box into the pocket. To save the power,the heated insole will be work with a automatic circle.Use more effective.