We have a thick wool overlay on our bed, and the electric blanket is under it and has been 3yrs now with no problem.

Sheffield-er wrote:

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Does anyone know if you can safely use egg carton overlay on top of (or under) an electric blanket ??
... Val 

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 Weve had a thick wool overlay on our bed for 3yrs, and we have the electric blanket under it and never had a problem!