Anti Ice Mat for Stairs

Someone posted something last year about mats you could buy to put on your outside stairs and then pick up to remove ice build up. Does anyone remember the brand and where these could be purchased?

Be sure to get one that is heavy enough not to be blown away by high winds before the ice forms on it.

I cut shingles to size. Since it they're dark they get warm in the morning so a lot of ice just melts.Also, rough texture can help with footing. Someone nails their shingles for year round use.