Product review (1 stars): My freezer has coil shelves and this type of mat is bad, because it doesn't allow the air to circulate ...
Nothing on the write-up for these says that it is only for glass shelves. My freezer has coil shelves and this type of mat is bad, because it doesn't allow the air to circulate around the coils. Do not buy these mats unless your shelves are glass in your freezer.