by 
The Curious Bag
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Jon-E hand warmers have been in existence since the 1950s. These trusty devices are still used by outdoor enthusiasts. The hand warmers fit comfortably in your pocket, providing heat for up to 12 hours a day.
Structure
The Jon-E hand warmer is made of stainless steel. It looks like a pocket flask but has a mechanism similar to a lighter. The top portion of the hand warmer has vent holes that allow the heat to warm your pocket.
Mechanism
Jon-E hand warmers run on Jon-E Hand Warmer Fluid or Zippo lighter fluid. The fluid fuels the hand warmer, allowing the wick to be lit. After the wick is extinguished, the hand warmer will provide heat for up to 12 hours. The intensity of the heat is adjustable.
Fluid
According to www.safetycentral.com, Jon-E Hand Warmer Fluid is known for being odorless and clean. Many convenience stores and outdoor-adventure stores sell this fluid.
Placement
The Jon-E hand warmer typically is placed in a side pocket to provide continual refuge for cold hands. However, some stores sell a special "body belt," placing two warmers over your kidneys to keep your whole body warm in cold temperatures.
Benefits
The Jon-E hand warmer is durable, safe, convenient and an ideal tool for outdoor adventures. Replacement parts are readily available at many outdoor-equipment stores.
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