La description

Now with the new Jett Heat Vest™ you can maintain comfort and productivity – without layers of bulky clothes. You’ll feel warmer, healthier and more energetic at the same time! The Jett Heat Vest™ emits a spectrum of natural sunlight with a wavelength of 4~***0 microns, NASA points out that wavelength of 6~*4 microns of Far Infrared (FIR) can absorb radiant heat from the human body, then release the energy to accelerate metabolism, improve circulation and provide warmth. Available in either Vest or Jackets styles, the Jett Heat Vest™ features: ✔ Far Infrared (FIR) heated ✔ Perfect relief for bad backs and muscle soreness ✔ Handy *-setting heat control ✔ A 4 hour battery pack or optional larger pack