The type of heating element used in the device.
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Wire. A heating element in the form of a high-resistance alloy wire that generates heat when an electric current is passed through. Such heaters are relatively inexpensive, while they heat up quickly and retain heat for some time after switching on. On the other hand, wire is stiffer than carbon fibre and can be uncomfortable, and is also considered less reliable.
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Carbon fibre. Heating elements based on carbon fibre are considered more durable and convenient than wire ones. Among other things, they are softer and do not stand out as much under the shell of the heating element; in addition, carbon fibre is more resistant to bending and folding. The disadvantages of this option are, firstly, a rather high cost, and secondly, a slightly lower heating rate.
