Heated Hat 3.7V/3400Mah Battery Striped Thermal Knitted Hat

MSDS, UN38.3 certificate listed.

with2pcs 3.7V 3400mA rechargeable Reachargeable Li Polymer battery heating warm socks (long)

 Support even heating distribution 6-10 hours

It features a Viscose/Nylon/Spandex blended cap which provides you with a tight fit to trap your head's natural heat in while still producing comforting heat.