When exposed to heat source it loses life because the crystals are activated (they react by activating with a heat source even if it is not a foot)

May be less experienced by people with reduced circulation (for example, the elderly)

Immediate results (5 min to maximum one hour)

One season

For the warming insole (does not exceed body heat) leads to a warmer temperature but does not make the foot sweat in relation to the body circulation of the individual person. (Improves circulation)

To ensure maximum durability, after normal daily use, remove the insole from the shoe and leave it in a dry and aerated place.

The difference is that they are breathable and not invasive, I do not have to anoint my feet.

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