After sitting on seat for a long drive you can just see the outline of the mat.
I'm about to order heated seats through Allon White. A 3 month wait at the moment, apparently - so it'll be just in time for autumn. The lady of the house needed no persuading for this expense. As to seeing the outline of the mat, is this a problem? Has the appearance got any worse (ie, become permanent to any degree)? Is there anything else I should know about the results of retro-fitting heating mats?