Kanes are fantastic heat pads. They aren't thin, flexible heat mats with a zip cord. They are rigid, thick (the heated area is around 1/2" thick) with a round 3-wire cord and 3-prong plug. If you want to use one under a cage, you must elevate the cage as needed. Their heat is evenly distributed over the area, and they don't waste energy heating underneath. However, you must use a dimmer or controller to make sure the temps are boa-friendly.
You can wash them with water and sponge or hose them off with no worries.
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Mark G
Assorted rosy boas, some annulata. That's it.