Bests & Worsts Reviews from Amazon

There pretty mats light weight and there suppose to be heat resistant however I noticed after having dinner and removing a warm plate from the mat this is what was left on my new glass table I had to use windex and a hard piece of plastic to rub off whatever that was from the mat and this happened on all four or the mats,Tried to email the seller but no one answered me smh Oh well I guess you get what you pay for and Now I must by new table mats...