Yes the shelves are wire permitting air to flow which aids in the frost free feature.
Thre are 4 wire shelves. They rest on tracks formed by the sides protruding inward. The top shelf has only 1 set of tracks to rest on. The middle 2 shelves each have 2 sets of tracks to rest on. The 2 sets of tracks for each are about 2-3 inches apart. There is a wire basket in the bottom. The bottom wire shelf rests on a set of tracks just above the wire basket.