I prefer ones that are like fitted sheets, so have no cords. They are so much easier to put on. Mine is from Lakeland, but I'm sure there are other brands. I can feel the wires, so I put it under the mattress topper. It still warms the bed.
I made a big mistake with my latest blanket as I can feel all the wires. Does anybody have a thick electric blanket that is cosy. Also it needs to cover all the bed not just the feet. Thanks